Charlie Sheen and his wife, real estate investor Brooke Mueller, welcomed twin boys -- Bob and Max -- Saturday in Los Angeles. The new arrivals are the couple's first children together. On March 12, Sheen told Extra he was officially "on standby" for the twins' impending arrival.

Check out stars' pregnancy cravings!

"What time is it?...It could be tomorrow, next week. We're on standby," he admitted. Prompting their heightened alert was Mueller's overnight trip to an L.A. hospital last month after experiencing premature contractions, not uncommon in women carrying twins.

See which other Hollywood parents have twins.

The couple -- who met through Eric Dane and his wife Rebecca Gayhart in 2006 -- said they had not yet settled on names. "We're still sort of circling Bob and Nik...N-I-K," the actor, 43, told Extra.

Find out what other celebrity baby names mean.

Sheen and Mueller, 31, announced they were expecting last summer. "Brooke and I are thrilled! She's the best stepmom Sam, Lola and Cassandra could ever hope for," Sheen told Us at the time, referring to his three daughters, Sam, 5, and Lola, 3 (with ex-wife Denise Richards), and Cassandra, 23 (with ex-girlfriend Paula Profitt).

Get more Us! Follow us on Twitter, Friend us on Facebook, Join Us Weekly's Celebrity Fantasy League, Subscribe to Us Weekly