Britney had some botox and lip fillers around 2010/2011 which changed her face a bit, but then her face settled. I think she got her lips done again recently which changed her smile a little, but she still looks beautiful
But when Brit has natural make-up, she looks the same as she did years ago.
Here are her facial changes since 2009, still looking gorgeous.
And Gaga had some lip fillers and botox too back in 2012, but that's it. I don't think she's done it in a while and her face has settled.
Amy had a boobjob about 18 months before she passed away