Gwen Stefani expecting her third child?

Updated: May 13, 2010, 16:12 PM IST

Los Angeles: `No Doubt` star Gwen Stefani is reportedly pregnant with her third child with husband Gavin Rossdale.

The `Sweet Escape` singer, who already has sons Kingston, three, and 19-month-old Zuma, is said to be expecting again and is experiencing bad morning sickness, reported OK! magazine.

"Gwen is having a really rough time this pregnancy. She had all-day morning sickness for a while with Zuma, but he`s sicker this time round and has been feeling exhausted and dizzy," said a source.

The 40-year-old singer is keen to keep the pregnancy a secret for as long as possible and has been covering up her baby bump.

At an event in New York last week, an onlooker said, "Gwen was pulling at her shirt to keep it away from her body.

It seemed really strange, but then, when she turned to the side, I could see why. She definitely had a baby bump!"

Stefani recently revealed she is "running out of time" to have another child but is wary of expanding her brood.

"No one could have prepared me for how awesome motherhood is, and how hard. I often feel like I`m running out of time. But I don`t want to spread myself so thin that I can`t be good for them. Poor Zuma, he`d be the middle guy. I`m not focusing on it right now, but it`s not up to me anyway, you know? These things are miracles, so we`ll see," she said.