Gwen Stefani's pregnancy and baby bump watch is drawing lots of attention in 2013. The "Rich Girl" singer, 43, reportedly wasn't expecting her third child, but the No Doubt performer and Gavin Rossdale are excited about it.

According to a new US Weekly report, the rock star couple is ecstatic about the baby news, but Stefani is keeping quiet about the details.

In fact, the blonde bombshell is hiding her baby bump reportedly in baggy, loose-fitting clothes lately. The singer, who is known for her super-toned body and rock-hard abs, wore another figure-hiding outfit while dropping her 5-year-old son, Zuma off to a California school on Wednesday, reported Hollywood Life.

The parents did not plan to welcome another child into their family, but Stefani is known as a hot mama in her early 40s.

"Gwen and Gavin are shocked," a friend of the couple told US. "They weren't trying - it just happened."

Apparently, there were some warning signs that Stefani was with child for the third time before the couple reportedly learned of the surprise pregnancy.

"She started feeling sick a month ago, so she took a test,"  the friend continued to tell US. "They're ecstatic!"

Stefani, who is already mom to Zuma and 7-year-old Kingston, had expressed interest in expanding her family some time ago. But after a certain point, the singer had become comfortable with just raising her two sons.

But she is dying to have a baby girl to balance out the family, the friend also explained.

Stefani is also known to work out alot, so many fans suspect that a pregnancy will not slow or stop her from exercising. The L.A.M.B and Harajuku Lovers designer also eats healthy.

Excited for Stefani and Rossdale? Tell us your thoughts in the comments section below!