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The countdown is on for three of the sexiest preggos in Hollywood ... Jessica Alba, Selma Blair and Tori Spelling!

Which Hollywood starlet will give birth first? Judging by Ms. Blair's massive bump, our money is on her!

The 38-year-old actress took a stroll with her boyfriend Jason Bleick in Hollywood ... ending up at Chateau Marmont. We're lovin' her long grey dress. The snug fitting frock really emphasizes her extra large belly. Awww!

As for Jessica Alba, she spent a day shopping with hubby Cash and daughter Honor in Santa Monica. Tori Spelling was also in Santa Monica ... having fun with her family at a birthday party. The former 90210 star even painted her face.

These ladies have no problem staying active throughout their pregnancy. No wonder they look so good!

See Ms. Alba and her entire family ... after the jump.