Jennifer Lopez feels sexier than ever.

The 43-year-old singer - who split from ex-husband Marc Anthony in 2011 and is now dating Casper Smart - has been working out more than ever in the past few months and told friends she is loving the results, which include adding five pounds to her famous derriere.

A source told America's OK! magazine: ''She says she's addicted to how exercise makes her feel and look.

''She starts her day with an hour of cardio, then does a lot of squats and lunges because they really help to lift the rear and make it more shapely.

''She's put on at least five pounds and it's all gone to her booty. She's been working out non-stop for months, focusing on her lower body and bulking up.

''She knows she's not 23 anymore but she says she feels just as sexy as she did back then.''

Jennifer, 43, is also in a good frame of mind mentally, which she credits to Casper, for helping her to believe in love again.

She said: ''It's nice when someone comes along, and it works. It's great. I'm lucky to have someone in my life now who understands my family and accepts them.

''I now believe in the fairy tale more than ever. I believe in happily ever after with love.''