Grady Smith
February 17, 2012 AT 05:00 AM EST

Beyoncé and Jay-Z introduce Blue Ivy Carter?
She’s already appeared on the Billboard Hot 100 (thanks to Daddy’s single ”Glory”). Now Blue Ivy Carter, born Jan. 7, is causing yet another sensation after her parents released photos on Tumblr. ”We welcome you to share our joy,” the singer, 30, and rapper, 42 — who have also applied to trademark their daughter’s name — wrote on the Web page Feb. 10, alongside a handful of charmingly candid snapshots.

Robert Downey Jr. welcomes a son
The Iron Man star, 46, and his movie-producer wife, Susan, 38, delivered a baby boy, Exton Elias Downey, on Feb. 7 in Los Angeles. This is their first child together. Downey has another son, Indio, 18, from his previous marriage.

Jason Lee gets ready for baby No. 3
The Up All Night actor, 41, and wife Ceren Alkac are expecting a son in June. The couple also have a 3-year-old daughter named Casper, and Lee has an 8-year-old son, Pilot, from a previous relationship.

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