Jennifer Lopez reveals her secret weapon

Meanwhile, Lopez's former fiancée, Ben Affleck, has claimed that breaking up from her improved his career.

The actor - who starred with J.Lo in box office flops 'Jersey Girl' and 'Gigli' - says during his highly publicised relationship with his ex-love he became "cynical" about his career.

He said: "I did popcorn stuff. But I didn't realise that there are good popcorn movies and bad popcorn movies.

"Ultimately, I found myself with the horrible feeling of being trapped inside this tabloid situation where my personal life was all out there.

"I kind of made a decision to just do the kind of movies I want and that I could be proud of being in, and not work for money or work to be famous."