White hot! Janet Jackson shows off dramatic weight loss in sexy plunging gown at amFAR event in Cannes

 She's been a yo-yo dieter all her adult life, but Janet Jackson says she finally has a handle on her ideal weight. And she certainly looks like a woman who is at ease.

Last night she arrived at amFAR's Cinema Against AIDS annual ball at Cannes in a stunning bright white Pucci by Peter Dundas gown that showed off her slim, toned frame.

The 46-year-old paired the show-stopping number with shoes by Giuseppe Zanotti and jewelry by Pomellato.

The singer has become a spokesperson for NutriSystem after her most recent successful attempt to battle the bulge. 

Michael Jackson's little sister is dedicated to helping others shed weight, as much for their health as anything else... as she has admitted that she put her own in danger by being overweight. 

She told Prevention magazine: 'Health was always a concern. When I gained weight in 2005, my nutritionist was very worried. I was close to having diabetes.