Britney Spears on 'How I Met Your Mother'

Musicians on TV

Is it good or bad that Britney was the funniest part of this show? (Josh Radnor and guest star Britney Spears star on How I Met Your Mother. (Photo: CBS)

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Britney Spears o... Is it good or bad that Britney was the funniest part of this show? (Josh Radnor and guest star Britney Spears star on How I Met Your Mother. (Photo: CBS)
Jennifer Lopez o... It's a good think Jack just happened to know all the moves to J-Lo's songs, because this diva does not appear without an entourage. NEW YORK - OCTOBER 23: Singer/actress Jennifer Lopez attends the 25th annual Night of Stars hosted by Fashion Group International at Cipriani Wall Street on October 23, 2008 in New York City. (Photo by Stephen Lovekin/Getty Images)
Cher on 'Will & ... Even Jack thought Cher was a drag queen when he first saw her, and Jack is her biggest fan. LOS ANGELES, CA - FEBRUARY 10: Singer Cher speaks onstage during the 50th annual Grammy awards held at the Staples Center on February 10, 2008 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
The Who on 'The ... Homer tears Springfield apart when he has The Who play on his side of the wall.
Metallica on 'Th... Mole Man helps Metallica rock out on 'The Simpsons.' (Photo: Fox)
The White Stripe... Only whilst Simpsonized, does Jack White have the slightest hint of color to his skin. (Photo: Fox)
Jessica Simpson ... Jessica Simpson playing the role she plays best, a bikini-clad blonde. (fox)
Alice Cooper on ... Alice Cooper tries to channel back to his glory days on 'That 70's Show.' (fox)
Lindsay Lohan on... TOKYO - OCTOBER 22: Actress Lindsay Lohan at the front row of the Charlotte Ronson Spring/Summer 2009 Fashion Show at the National Stadium on October 22, 2008 in Tokyo. (Photo by Junko Kimura/Getty Images for Charlotte Ronson)
Victoria Beckham... Posh steals the spotlight from Bride-to-Be Whillamena on Ugly Betty. (Photo:ABC)
Shirley Manson o... Shirley Manson's no "Stupid Girl" on The Sarah Connor Chronicles. (Photo:Fox)
Ashlee Simpson o... Before her days as bad-boy Pete Wentz's wife, she was a good girl on '7th Heaven' NEW YORK - APRIL 17: Singer Ashlee Simpson arrives at the Conde Nast Traveler 8th Annual Hot List party at Mansion on April 17, 2008 in New York City. (Photo by Bryan Bedder/Getty Images)
Steven Tyler on ... Steven Tyler plays the annoying neighbor on 'Two and a Half Men' (Photo:CBS)
Feist on 'Sesame... As she demonstrated with her smash hit "One, Two, Three, Four" Feist can actually count; apparently this qualifies her to be on 'Sesame Street.' NEW YORK - JANUARY 12: Indie rock musician Leslie Feist attends the New York Times Arts & Leisure Week at the Times Center on January 12, 2008 in New York City. Feist's was the singer and composer of the popular '1234' song featured on Apple's iPod Nano commercial. (Photo by Steven Henry/Getty Images)
Snoop Dog on 'On... Snoop Dog on 'One Life to Live?' Is Snoop trading in his fanbase of suburban kids for their mothers? (Photo:ABC)
Jared Leto on 'M... Yes it's true. Before Jared Leto sang songs about teen angst, he starred in a show about it. LOS ANGELES, CA - SEPTEMBER 28: Singer Jared Leto arrives at the Yes! on Prop 2 Party at a private residence on September 28, 2008 in Los Angeles, California. (Photo by Michael Buckner/Getty Images)
David Bowie on '... Putting his voice to good use, Bowie did voice acting for the cartoon. NEW YORK - APRIL 26: Singer David Bowie attends the Vanity Fair Tribeca Film Festival Party at The State Supreme Courthouse April 26, 2006 in New York City. (Photo by Evan Agostini/Getty Images for TFF)
Billy Rae Cyrus ... Leeching onto his daughter's fame, Billy Rae Cyrus plays, who else? her father. (photo:disney channel)
Janet Jackson on... PARIS - JUNE 30: Actress/singer Janet Jackson arrives at the Dior '09 Fall Winter Haute Couture fashion show on June 30, 2008 in Paris, France. (Photo by Francois Durand/Getty Images)
Chris Brown on '... There were black people on 'The OC?' LOS ANGELES, CA - SEPTEMBER 07: Singer Chris Brown poses with the Best Male Video award in the press room at the 2008 MTV Video Music Awards at Paramount Pictures Studios on September 7, 2008 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)