Rumer Willis — I'm Ready to Party Again

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Rumer Willis
returned to the Hollywood party scene last night … slinking into a SAG Awards after-party just 6 days after her mother partied her way into the hospital last week.

Rumer — who was at her mom”s home when Demi went into a semi-conscious, convulsive state last Monday — was seen entering the legendary Chateau Marmont hotel on the Sunset Strip last night … by herself.

As we previously reported, Rumer and Demi had been partying together in Hollywood just 2 weeks before Demi”s medical emergency.

We”re told Demi is still receiving treatment for substance abuse.