Jennifer Lopez loses her bum

Jennifer Lopez has lost her famous butt.

The singer-and-actress showed off her new slimmed-down figure on TV talk show 'Good Morning America' this week, and although she looked fantastic in a designer dress her once voluptuous rear was gone.

Jennifer's husband Marc Anthony - with who she has 15-month-old twins Max and Emme - is said to be distraught with his wife's diminished curves.

A source said: "Jennifer's really into triathlons and has stepped up training. She's super-fit but it's eaten all her curves, especially her behind, Marc is really upset."

During her interview with host Diane Sawyer, Jennifer confessed she wanted to get fit after giving birth because she didn't feel as though her body was her own while she was pregnant.

The 39-year-old star - who competed in a triathlon last September - said: "Your body becomes sort of this temple for the babies. I needed to do the triathlon to feel like Jennifer again.

"It was really great for me physically, emotionally, mentally. It got me thinking about achieving again, doing again."