Is 47-year-old Maggie Shiu joining the ranks of pregnant celebrities?

The TVB actress sparked speculations that she could be having a bun in the oven, after she was spotted touching her tummy when she's out with rumoured boyfriend Vincent Sze recently.

The pair was spotted at the Central district of Hong Kong, with Shiu holding Sze's arm as they walked together under one umbrella.

Throughout, she kept touching her tummy like a pregnant woman does, reported the Hong Kong media.

The actress previously dated TVB producer Jonathan Chik and Hong Kong star Ekin Cheng.

Since her high-profiled break-up with the latter in 1999, it took nearly a decade before she was romantically linked to Sze, a France-born action star who is 10 years her junior.

The pair met on the set of Hong Kong flick Tactical Unit.

However, Sze denied that Shiu is pregnant, saying: "Definitely not! We went for haircut that day. There's nothing special. I didn't see her touching her tummy. It's impossible for me not to know."