PHOTOS: Sharapova-Serena in X-rated Turkey talk

Tennis stars Maria Sharapova and Serena Williams confessed that they got distracted by some X-rated girl talk during the draw ceremony for the WTA Championship - the tour's flagship event.

During the ceremony in Istanbul on Monday, the tennis stars were spotted laughing and whispering.

"You do not want to know about it," Sydney Morning Herald quoted Sharapova as saying when asked about the subject of the talk during the draw ceremony.

"It's not PG-13," she said in reference to the movie rating urging parental guidance for kids under 13.

"We did not talk about tennis," she added, when pushed to talk about it.

Sharapova later revealed more about their secret talk saying, "Obviously when you're sitting there for 45 minutes and you're listening to a lot of Turkish speeches, at some point you're going to start some conversations in English."

"It may be a little inappropriate and rude maybe, but we couldn't -- we were just joking about a few things," she said.

Williams too had hinted at humorous but unrepeatable indiscretion.

Reminded that some time back she had tweeted about a "what-was-I-thinking moment", she said "yeah."

"No absolutely cannot share," she said when she was asked to share her talk.

"It was definitely a what-was-I-thinking moment. I'm glad I'm not in that moment any more," she added.

Elite female tennis stars including Sharapova and Williams posed for a glamorous photoshoot ahead of the tournament, which started on Tuesday.

They were joined by Li Na, Angelique Kerber, Petra Kvitova, Victoria Azarenka, Agnieszka Radwanska and Sara Errani at the TEB BNP Paribas WTA Championship draw ceremony on Monday.

The girls with their make-up done, posed for the photographers, as they made their grand entrance in front of the world's press.

The ladies have been split into two groups for qualifying with the best making it through to battle it out in the semi-finals then final, to land the prestigious title.