Gwyneth Paltrow has been looking super toned since she first using the Tracy Anderson Method several years ago.
And at 40, the mother-of-two is feeling more confident than ever with her figure.
And when it comes to her backside, the actress claims she's been told she has the 'butt of a 22-year-old stripper'.
Baby
got back: Gwyneth Paltrow shows off her toned physique in a purple
Victoria Beckham dress at the opening of the Tracy Anderson flagship
studio in Brentwood
The blonde spoke of her body confidence as she attended the opening of Tracy's flagship studio in Los Angeles on Thursday night.
And what better way to show off her physique than in a purple Victoria Beckham shift dress and killer Michael Kors heels.
Speaking on the red carpet, referring to her backside, Gwyneth said: 'I said, "You know, this isn't so bad for 40, right?"
It's all thanks to her! Gwyneth poses alongside fitness guru Tracy Anderson and hair stylist David Babaii
'And [my friend] goes, "It's not so bad for a 22-year-old stripper!"'
Before she was introduced to Tracy by Madonna - who no longer works with the trainer - Gwyneth admitted she had accepted her body wasn't going to be any more toned.
She said: 'Oh, I knew it would never change.
'I had exercised before I had met her … I had done Ashtanga yoga and pilates and I [ran] and I thought I was fit, you know...'
No pain, no gain: Gwyneth says she works out to Tracy's regime every single day
Now a devotee of Tracy's method, Gwyneth works out every day, even when it's a struggle to motivate herself.
She explained: 'I just sob and then kick and scream and then I just force myself to do it.
'I just got obsessed. When you see results like that, I started following everything she said and she completely transformed my body and I'm so grateful.'
Stripper butt? Gwyneth showing off her derriere in September 2012 (left) and in May 2011 (right)
And at 40, the mother-of-two is feeling more confident than ever with her figure.
And when it comes to her backside, the actress claims she's been told she has the 'butt of a 22-year-old stripper'.
And what better way to show off her physique than in a purple Victoria Beckham shift dress and killer Michael Kors heels.
Speaking on the red carpet, referring to her backside, Gwyneth said: 'I said, "You know, this isn't so bad for 40, right?"
It's all thanks to her! Gwyneth poses alongside fitness guru Tracy Anderson and hair stylist David BabaiiBefore she was introduced to Tracy by Madonna - who no longer works with the trainer - Gwyneth admitted she had accepted her body wasn't going to be any more toned.
She said: 'Oh, I knew it would never change.
'I had exercised before I had met her … I had done Ashtanga yoga and pilates and I [ran] and I thought I was fit, you know...'
No pain, no gain: Gwyneth says she works out to Tracy's regime every single dayShe explained: 'I just sob and then kick and scream and then I just force myself to do it.
'I just got obsessed. When you see results like that, I started following everything she said and she completely transformed my body and I'm so grateful.'