A week after Serena Williams posted a selfie to her Instagram account of herself in a bikini while on vacation, she was stripping down for cameras again. This time, Williams was shooting a television commercial for the Australian lingerie brand Berlei.

Serena Williams Takes Bikini Selfie

According to the Daily Mail, Williams showed off her curves in a variety of outfits and had a few words to say about being intimidated by wearing next to nothing in front of the camera. "I'm a normal woman - I can get self-conscious. But I think that is just natural for women to feel that way," said Serena.

Berlei's marketing manager had glowing reviews of Serena, indicating that she was a real pleasure to be around and that she seemed like a natural while she was on the set. Serena no doubt drew on her experience as an 18-time Grand Slam singles winner to give her some extra confidence, although she admitted to being comfortable with her body.

"I have learned to be proud of my curves and to embrace them," she said. "It's important to love who you are and realize that you're beautiful, no matter what society says."

Sharapova just Average?

Of course, it must be pretty easy to feel beautiful when you have the kind of body that Serena was seen rocking in those Instagram pictures from her vacation. She claimed last month on Twitter to be single and "not by choice," and it certainly seems like her recent barrage of self-promotion is a strong first step to changing that. Below is Serena's bikini selfie.