Celebrity Bump Watch!

The singer, 23, covered up in a baggy leather jacket on March 31 while partying in New York with her boyfriend, Fall Out Boy bassist Pete Wentz, 28. A few days later, the twosome announced their engagement – and now, they've joined the club of expectant Hollywood parents!

Jolie, 32, fueled rumors that she was expecting another child with Brad Pitt when she stepped out at the Screen Actors Guild Awards in a flowing Hermes gown. But on April 7, her belly was proudly on display when she honored friend Mariane Pearl at the Vital Voices Global Leadership Awards gala in Washington, D.C.

The Oscar winner dressed for two in a braided YSL gown April 14 when she joined husband Keith Urban at the CMT Awards in Nashville. And while happy, Kidman has felt some ups and downs – namely, severe morning sickness.

The actress, 26, accessorized her flowing dress with an ever-growing baby bump while stepping out for a March 22 bash in Beverly Hills with fiancé Cash Warren. Alba and Warren are expecting their first child in late spring.

Stefani – who showed off her fashion flair during her first pregnancy – maintained her stylish look on April 12 when she hit the Santa Monica, Calif., beach with son Kingston, who turns 2 in May. But will he be getting a little brother or sister? They'll find out on delivery day, since the couple are keeping the gender a surprise.

The Office star, 36, proudly showed off her baby bump at the L.A. premiere of Leatherheads on March 11. But you'd never know that Kinsey and husband Warren Lieberstein were expecting their first child, a daughter, by watching The Office. "We've been desperately trying to hide her pregnancy on the show," costar Kate Flannery told PEOPLE. "She's behind a copier machine, behind a pile of papers. It's kind of funny."

The spotlight shifted from one Spears to another when Britney's little sister Jamie Lynn, 17, announced in late December that she was pregnant. The father: her longtime boyfriend Casey Aldridge. Since the news broke, the Zoey 101 star has been keeping a low profile in her hometown of Kentwood, La., where she was spotted shopping in April.

In the coming months, Spelling will be spending even more time at the playground in Beverly Hills: The actress and her husband Dean McDermott, are giving their son Liam, 1, a baby sister. "I've always wanted a little girl since I'm such a girly girl, and Dean always wanted a little girl as well," Spelling, 34, has said.

After a British tabloid published an article about her expanding waistline, Presley reluctantly announced her pregnancy. But the singer, 40, who's expecting her third child with husband Michael Lockwood (she has two from a previous marriage), can take heart: She's received an outpouring of support from fans.

Radiant at a recent red carpet premiere, Driver has joked about having 'round the clock morning sickness on The Tonight Show with Jay Leno after announcing her pregnancy to the talk show host. But one thing the Riches actress is keeping to herself: the identity of her baby's father.