The singer turned actress, who is currently going through a divorce with Jordan Bratman, stars opposite Cher, 64, in new flick Burlesque and said she received words of wisdom from her co-star.
The 29-year-old told US entertainment show Extra: 'We had crazy girl talk about love and life, and she talked about her ex-husbands, and it was a really good girl moment, she exceeded any and all expectations.'
Christina makes her acting debut in Burlesque and she is very 'proud' of her performance.
She added: 'The best part is being able to sit back and watch it and be proud of what you did.'
The film is released in the UK on December 17.