U.S. swim star Natalie Coughlin

SHANGHAI, CHINA - JULY 23: (L-R) Natalie Coughlin and Ryan Lochte of the United States participate in a press conference on Day Eight of the 14th FINA World Championships at the Main Press Center of the Oriental Sports Center on July 23, 2011 in Shanghai, China. (Photo by Quinn Rooney/Getty Images)

US swimmer Natalie Coughlin talks during a press conference on the eve of the start of the swimming competition at the FINA World Championships in the indoor stadium of the Oriental Sports Centre in Shanghai on July 23, 2011. AFP PHOTO / PHILIPPE LOPEZ (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

SHANGHAI, CHINA - JULY 30: (L-R) Natalie Coughlin, Rebecca Soni, Dana Vollmer and Melissa Franklin of the United States celebrate their gold medals in the Women's 4x100m Medley Relay during Day Fifteen of the 14th FINA World Championships at the Oriental Sports Center on July 30, 2011 in Shanghai, China. (Photo by Clive Rose/Getty Images)

SHANGHAI, CHINA - JULY 30: (L-R) Natalie Coughlin, Dana Vollmer and Rebecca Soni of the United States cheer on Melissa Franklin on the way to winning the gold medal in the Women's 4x100m Medley Relay during Day Fifteen of the 14th FINA World Championships at the Oriental Sports Center on July 30, 2011 in Shanghai, China. (Photo by Quinn Rooney/Getty Images)

US swimmer Natalie Coughlin jumps in the water prior to compete in the final of the women's 4x100-metre medley relay swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 30, 2011. The United States won gold. AFP PHOTO / MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

US swimmer Natalie Coughlin competes in the final of the women's 4x100-metre medley relay swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 30, 2011. The United States won gold. AFP PHOTO / MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

US swimmer Natalie Coughlin reacts after she competed in the final of the women's 100-metre freestyle swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 29, 2011. AFP PHOTO / FRANCOIS XAVIER MARIT (Photo credit should read FRANCOIS XAVIER MARIT/AFP/Getty Images)

US swimmer Natalie Coughlin arrives to compete in the final of the women's 100-metre freestyle swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 29, 2011. She finished eighth. AFP PHOTO / FRANCOIS XAVIER MARIT (Photo credit should read FRANCOIS XAVIER MARIT/AFP/Getty Images)

SHANGHAI, CHINA - JULY 28: Natalie Coughlin of the United States looks on after the Women's 100m Freestyle Semi Final during Day Thirteen of the 14th FINA World Championships at the Oriental Sports Center on July 28, 2011 in Shanghai, China. (Photo by Feng Li/Getty Images)

SHANGHAI, CHINA - JULY 28: Natalie Coughlin of the United States takes off her cap after she swam in heat nine of the Women's 100m Freestyle heats during Day Thirteen of the 14th FINA World Championships at the Oriental Sports Center on July 28, 2011 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

SHANGHAI, CHINA - JULY 28: Natalie Coughlin of the United States competes in heat nine of the Women's 100m Freestyle heats during Day Thirteen of the 14th FINA World Championships at the Oriental Sports Center on July 28, 2011 in Shanghai, China. (Photo by Adam Pretty/Getty Images)

In a picture taken with an underwater camera US swimmer Natalie Coughlin competes in the heats of the women's 100-metre freestyle swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 28, 2011. AFP PHOTO / FRANCOIS XAVIER MARIT (Photo credit should read FRANCOIS XAVIER MARIT/AFP/Getty Images)

US swimmer Natalie Coughlin sticks her tongue out as she holds her bronze medal on the podium during the award ceremony for the women's 100-metre backstroke swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 26, 2011. AFP PHOTO / PETER PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)

US swimmer Natalie Coughlin looks on after she competed in the final of the women's 100-metre backstroke swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 26, 2011. She won bronze. AFP PHOTO / PETER PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)

US swimmer Natalie Coughlin sticks her tongue out after she competed in the final of the women's 100-metre backstroke swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 26, 2011. She won bronze. AFP PHOTO / PETER PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)

US swimmer Natalie Coughlin dives as she competes in the final of the women's 100-metre backstroke swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 26, 2011. She won bronze. AFP PHOTO / PETER PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)

US swimmer Natalie Coughlin (c) gets ready prior to compete in the final of the women's 100-metre backstroke swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 26, 2011. She won bronze. AFP PHOTO / FRANCOIS XAVIER MARIT (Photo credit should read FRANCOIS XAVIER MARIT/AFP/Getty Images)

SHANGHAI, CHINA - JULY 26: Natalie Coughlin of the United States reacts after winning the bronze medal in the Women's 100m Backstroke Final during Day Eleven of the 14th FINA World Championships at the Oriental Sports Center on July 26, 2011 in Shanghai, China. (Photo by Adam Pretty/Getty Images)

SHANGHAI, CHINA - JULY 26: Natalie Coughlin (L) of the United States reacts after winning the bronze medal in the Women's 100m Backstroke Final during Day Eleven of the 14th FINA World Championships at the Oriental Sports Center on July 26, 2011 in Shanghai, China. (Photo by Adam Pretty/Getty Images)

SHANGHAI, CHINA - JULY 26: Natalie Coughlin of the United States walks out before the Women's 100m Backstroke Final during Day Eleven of the 14th FINA World Championships at the Oriental Sports Center on July 26, 2011 in Shanghai, China. (Photo by Adam Pretty/Getty Images)

US swimmer Natalie Coughlin competes in the heats of the women's 100-metre backstroke swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center in Shanghai on July 25, 2011. AFP PHOTO / FRANCOIS XAVIER MARIT (Photo credit should read FRANCOIS XAVIER MARIT/AFP/Getty Images)

Natalie Coughlin (L), Jessica Hardy (R) and Melissa Franklin (C) react after they competed in the final of the women's 4x100-metre freestyle swimming event in the FINA World Championships at the indoor stadium of the Oriental Sports Center, in Shanghai, on July 24, 2011. They won silver. AFP PHOTO / FRANCOIS XAVIER MARIT (Photo credit should read FRANCOIS XAVIER MARIT/AFP/Getty Images)

SHANGHAI, CHINA - JULY 23: Natalie Coughlin of the United States participates in a press conference on Day Eight of the 14th FINA World Championships at the Main Press Center of the Oriental Sports Center on July 23, 2011 in Shanghai, China. (Photo by Feng Li/Getty Images)

SHANGHAI, CHINA - JULY 23: Natalie Coughlin of the United States participates in a press conference on Day Eight of the 14th FINA World Championships at the Main Press Center of the Oriental Sports Center on July 23, 2011 in Shanghai, China. (Photo by Feng Li/Getty Images)

SHANGHAI, CHINA - JULY 23: Natalie Coughlin of the United States participates in a press conference on Day Eight of the 14th FINA World Championships at the Main Press Center of the Oriental Sports Center on July 23, 2011 in Shanghai, China. (Photo by Quinn Rooney/Getty Images)

SHANGHAI, CHINA - JULY 23: Natalie Coughlin of the United States participates in a press conference on Day Eight of the 14th FINA World Championships at the Main Press Center of the Oriental Sports Center on July 23, 2011 in Shanghai, China. (Photo by Quinn Rooney/Getty Images)