Which celebrities have admitted to having plastic surgery?

Woman removing bandages from faceIt is a given that a celebrity will regularly change their look – but when it comes to going under the knife, many prefer to keep schtum. Some stars, like Amanda Bynes, are actually upfront about the cosmetic surgery they have had, so who exactly are they? Here are three more who have opened up about the work they've had done.Ashlee SimpsonSimpson had rhinoplasty in 2006. Her response to rumours was “Everybody's already saying it, so I just don't talk about it” until her dad then acknowledged the surgery. He told Fox News: “Girls have their own ideas. Anyway, there was a real problem with her breathing and that was cured.” Ashlee later confirmed: “I was never really unhappy with how I looked, [and] I don’t think I am more beautiful than I was [before]. I just see the same old goofy girl I see every day.”Dianna AgronIn 2011, the "Glee" star told David Letterman that she'd had her nose done, after breaking it twice in quick succession. She explained: “I couldn't get it fixed because we were in the middle of doing this concert tour and we were filming. We had a day off and I met up with some of my friends and we were dancing. And again, there was another collision of sorts. I must be turning too quickly, people don't see me coming or something, but it's fixed now.”Ashley TisdaleThe High School Musical star opened up about her nose job in 2008. She said: “People were saying I was 'unveiling my look', but I was still recovering! That's not what I look like right now… I think I still look like me.”