Since the birth of her son Max in 2008, the singer has had a fuller figure, which she says she loves and is proud of.
She told Lucky magazine about her curvier figure, saying: "Actually, the challenge I've always had is being too thin, so I love that now I have a booty, and obviously I love showing my cleavage."
The 31-year-old also urged other curvy women to embrace their bodies and be proud of them.
The former Mickey Mouse Club star added: "Hey, if you can work it and you can own it, that confidence is going to shine through."
Aguilera had her son Max with ex-husband Jordan Bratman, but the singer is now dating production assistant Matt Rutler.