Christina Aguilera has never felt sexier.

The 'Dirrty' singer unveiled her brand new, slimmer figure in a flattering little black dress on Wednesday's episode (18.09.13) of 'The Tonight Show with Jay Leno', enthusing that she has never been more confident in her own skin.

The grinning pop star said: ''I'm 32, and I feel sexier than ever, just because you know what you want.''

The sultry star - who was also rocking red lips and curly platinum bob - also revealed time has taught her to be more laid back in the bedroom and let her partner take control.

Christina cheekily quipped: ''The one place I don't need to be in control is in the bedroom. I'm a big micromanager. I'm a stickler for organisation even when I'm in the studio - so I think every woman should just relax and allow herself to be pleased in the bedroom. It's the one place I can let go, 'You do the work.' ''

'The Voice' US judge also opened up about her five-year-old son, Max, who she has with ex-husband Jordan Bratman.

She said: ''I bought a new house and he's going to a new school, so it's a lot for the little guy, but he's great. He's the joy of my life.''