The 46-year-old, who recently admitted that he has quit marriage and drinking, tweeted a picture of himself watching last night's premiere, featuring his replacement Ashton Kutcher.
"Surrounded by friends and watching the premier of Two and a Half Men. Odd... But cool..! So far a lot of laughs!!" Sheen wrote.
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Kutcher's debut on Two and a Half Men earned astronomical ratings last night, pulling in 27.8m.
Sheen was fired from Two and a Half Men in March after engaging in a public feud with series creator Chuck Lorre.
Sheen recently revealed that he agreed with the decision to fire him from the CBS sitcom, saying that he would have axed himself too.
While presenting at the 2011 Primetime Emmy Awards, Sheen wished his former series the best for the upcoming season.
> Read Digital Spy's review of Ashton Kutcher's first Two and a Half Men episode
Watch the new opening titles of Two and a Half Men below:
