Credit: Jeffrey Mayer/

Charlie Sheen was rushed to the hospital early Thursday morning, his rep confirms to

The L.A. Fire Department confirms to Us that it received a 911 call from Sheen's home at 6:35 a.m; TMZ reports that The Two and a Half Men actor, 45, was taken out of his L.A.-area home via stretcher and loaded onto an ambulance around 7 a.m.

Explains the rep to Us: "He was having severe abdominal pains and went to the hospital." Sheen was admitted to Cedars-Sinai Medical Center in Beverly Hills; his current condition is unknown.

According to an eyewitness, Sheen's ex-wife Denise Richards arrived at Cedars-Sinai mid-afternoon. The makeup-free Blue Mountain State actress wore fitted jeans, a white jacket and fringed suede boots.

Another source tells Us that Sheen's estranged wife Brooke Mueller was also seen headed to the hospital. "She's very, very upset," the insider says. "We're all praying." His father Martin Sheen was the last family member to arrive.

Earlier this month, the notoriously hard-partying actor -- who has spent numerous stints in rehab for his addictions -- was spotted downing vodka shots at the Palms Hotel in Las Vegas. That followed Sheen's Oct. 25 drunken, nude bender at NYC's Plaza Hotel. On Christmas Day 2009, Sheen got into a violent altercation with Mueller.

An insider recently told Us that Sheen ditched the sober coach hired following his Plaza Hotel incident. "He has not heard from Charlie since he told him not to start New Year's Day!"