Fitness guru Harley Pasternak has revealed that Lady Gaga is someone who is "very healthy" with a great amount of self-confidence. 

Pasternak works as Gaga's trainer and told New York Post's Page Six that she is physically fit and likes to take care of herself: "I think she loves her body. Historically she's someone who is always fit, but she's not someone who really ever let herself go."

He added that she's incredibly focused when she wants to be and enjoys adapting her favourite cuisines to make her food as healthy as possible:

"When she's mentally focusing on something creative, there's nothing she can't do. She's someone who likes to eat well and she loves her healthy versions of Italian food, her salads and her Japanese food -- she's a very healthy person."

"[Gaga] couldn't exercise for an extended period of time [when she was injured], so her body looked different. She felt bad about that, but when she was back to being physically active again, she got really fit."

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Watch footage of Gaga and Bennett performing together here: