Seth MacFarlane performs Sinatra at Milwaukee piano bar

Watch Sam Smith Sing Beyonce's 'Flawless' After Tweeting In Sick

It seems the "Family Guy" intro came to life for bar patrons of Lucille's Piano Bar in Milwaukee.

The FOX animated show's creator Seth MacFarlane showed up with a drink in one hand and a mic in another as he set out to perform a special rendition of Frank Sinatra's "Luck Be a Lady," among other songs, over the weekend.

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He was joined by his pal and former Gossip Girl star Jessica Szohr, and at one point in the video captured, he even does a little dance. "Thanks Seth MacFarlane for spending most of the night with us at Lucille's on Saturday night and singing a few songs!!" Lucille's Facebook page posted. "Pretty epic!"

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The 41-year-old entertainer isn't the only celebrity to be spotted sloppily singing. Sam Smith was caught on camera attempting to belt out Beyonce at a Nashville karaoke bar, and the video is too good to miss.

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Seth MacFarlane performs Sinatra at Milwaukee piano bar

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