The Osbourne family’s gotten a little bit bigger.

Jack Osbourne’s fiancée, Lisa Stelly, gave birth to their daughter, Pearl, on Tuesday, according to People magazine.

“America’s Got Talent” judge — and Jack’s mom — Sharon Osbourne tweeted, “Today I witnessed my first grandchild being born, life changing experience. She is an angel.”

Not to be outdone, sister Kelly Osbourne revealed yesterday that she adopted a rescue dog. The Pomeranian had been kept in a cage for the past year, she tweeted.