Local Mandopop star Stefanie Sun has been tight-lipped about her pregnancy so far.

But on Monday, as a treat for fans on her 34th birthday, the happy mother-to-be posted a photo of herself - baby bump included - on her Sina Weibo microblog.

Along with the picture was her upbeat entry: "Today's my birthday, I'm taking Baby out for a walk, thank you all for the wishes."

Sun's blog entry came just days after some paparazzi pictures of her "having satay at a shopping mall's foodcourt" started circulating online.

Netizens have jokingly commented that Sun, thanks to her pregnancy, is undergoing "a second puberty" and that "even her breasts are bigger now".

This article was first published in The New Paper.