Here's what Lou Bega of "Mambo No. 5 (A Little Bit of...)" fame looked like back in 1999: Ariola Records
Here's what Lou Bega looks like today: Tristar Media / Getty Images
Listen to "Mambo No. 5 (A Little Bit of...)" here: Here's what Natalie Imbruglia of "Torn" fame looked like back in 1997: RCA
Here's what Natalie Imbruglia looks like today: David M. Benett / Dave Benett / Getty Images
Listen to "Torn" here: Here's what Sisqó of "Thong Song" fame looked like back in 2000: Def Soul
Here's what Sisqó looks like today: Phillip Faraone / Getty Images
Listen to "Thong Song" here: Here's what Cassie of "Me & U" fame looked like back in 2006: Next Selection / Bad Boy / Atlantic
Here's what Cassie looks like today: Listen to "Me & U" here: Here's what James Blunt of "You're Beautiful" fame looked like back in 2005: Atlantic Records / Custard
Here's what James Blunt looks like today: David M. Benett / Dave Benett / Getty Images for Loci
Listen to "You're Beautiful" here: Here's what Sean Kingston of "Beautiful Girls" fame looked like back in 2007: Epic Records
Here's what Sean Kingston looks like today: Listen to "Beautiful Girls" here: Here's what Macy Gray of "I Try" fame looked like back in 1999: Epic / Clean Slate
Here's what Macy Gray looks like today: Arturo Holmes / Getty Images
Listen to "I Try" here: Here's what Gavin DeGraw of "I Don't Want to Be" fame looked like back in 2004: J Records
Here's what Gavin DeGraw looks like today: Steve Granitz / WireImage / Getty Images
Listen to "I Don't Want to Be" here: Here's what Estelle of "American Boy" fame looked like back in 2008: Atlantic / HomeSchool
Here's what Estelle looks like today: Jack Vartoogian / Getty Images
Listen to "American Boy" here: Here's what Willa Ford of "I Wanna Be Bad" fame looked like back in 2001: Lava / Atlantic
Here's what Willa Ford looks like today: Michael Tullberg / Getty Images
Listen to "I Wanna Be Bad" here: Here's what Amerie of "1 Thing" fame looked like back in 2005: Columbia
Here's what Amerie looks like today: Listen to "1 Thing" here: Here's what Trace Cyrus (Metro Station) of "Shake It" fame looked like back in 2008: Columbia
Here's what Trace Cyrus from Metro Station looks like today: Listen to "Shake It" here: Here's what Linda Perry (4 Non Blondes) of "What's Up?" fame looked like back in 1993: Interscope
Here's what Linda Perry from 4 Non Blondes looks like today: Kurt Krieger - Corbis / Corbis via Getty Images
Listen to "What's Up?" here: Here's what Sir Mix-a-Lot of "Baby Got Back" fame looked like back in 1992: Def American / Reprise
Here's what Sir Mix-a-Lot looks like today: Scott Dudelson / Getty Images
Listen to "Baby Got Back" here: Here's what Vanessa Carlton of "A Thousand Miles" fame looked like back in 2002: A&M
Here's what Vanessa Carlton looks like today: Bruce Glikas / Bruce Glikas / WireImage / Getty Images
Listen to "A Thousand Miles" here: Here's what Tweet of "Oops (Oh My)" fame looked like back in 2002: The Goldmind / Elektra
Here's what Tweet looks like today: Jason Kempin / Getty Images
Listen to "Oops (Oh My)" here: Here's what Eamon of "Fuck It (I Don't Want You Back)" fame looked like back in 2003: Jive
Here's what Eamon looks like today: Listen to "Fuck It (I Don't Want You Back)" here: Here's what Afroman of "Because I Got High" fame looked like back in 2001: T-Bones / Universal / Uptown
Here's what Afroman looks like today: Paul Archuleta / FilmMagic / Getty Images
Listen to "Because I Got High" here: Here's what Nina Sky of "Move Ya Body" fame looked like back in 2004: Universal / Next Plateau
Here's what Nina Sky looks like today: Andrew Toth / Getty Images for MoMA
Listen to "Move Ya Body" here: Here's what Kevin Lyttle of "Turn Me On" fame looked like back in 2003: Atlantic
Here's what Kevin Lyttle looks like today: Johnny Nunez / WireImage / Getty Images
Listen to "Turn Me On" here: Here's what Lene Nystrøm and René Dif (Aqua) of "Barbie Girl" fame looked like back in 1997: Universal / MCA
Here's what Lene Nystrøm and René Dif from Aqua look like today: Sam Tabone / WireImage / Getty Images
Listen to "Barbie Girl" here: Here's what J-Kwon of "Tipsy" fame looked like back in 2004: So So Def / Arista
Here's what J-Kwon looks like today: Listen to "Tipsy" here: Here's what Ryan Cabrera of "On the Way Down" fame looked like back in 2004: Atlantic
Here's what Ryan Cabrera looks like today: Michael Tran / Getty Images
Listen to "On the Way Down" here: Here's what the Baha Men of "Who Let the Dogs Out" fame looked like back in 2000: S-Curve
Here's what the Baha Men look like today: Listen to "Who Let the Dogs Out" here: And here's what Vitamin C of "Graduation (Friends Forever)" fame looked like back in 2000: Elektra
Here's what Vitamin C looks like today: Alberto E. Rodriguez / Getty Images
Listen to "Graduation (Friends Forever)" here: View comments