In her first appearance since giving birth, Christina Aguilera showed off a voluptuous post-baby body at the signing of her new “Back to Basics – Live and Down Under” concert DVD.

The singer looked ravishing in a low-cut chocolate brown number, bright red lipstick and killer heels.

In an interview with Ryan Seacrest of KIIS-FM radio Tuesday, where she talked about being a pop star mother and her upcoming DVD release, the singer said her experience during pregnancy would shape her next album.

“I’m very excited! I'm so inspired. I've got so much in me to write about. This next record, I want to have a lot of fun with it. I've been brainstorming for the last nine months of my pregnancy. This next album will have a whole new me — a different me,” Christina told Ryan Seacrest.

Aguilera was also thrilled to talk about his one-month-old son, Max and the privileges of being a mommy.

“It's so incredible, the most unbelievable thing. It's still the first couple of weeks. Every week something new happens - it's a constant change. He's doing these incredibly cute things and incredibly stinky things!, she told Seacrest.

She also said that she and her baby took part in a traditional Jewish ceremony, eight days after his birth.

“He did have a bris! It was really interesting because I’m not Jewish, but my husband is. I never really knew a lot of Jewish people growing up, I never knew about a bris. It's all a learning process. We had a lot of close friends come over and experience it with us. We're such a non-conventional couple, we had penis balloons everywhere!"

I suppose everybody liked the decorations…