Return Of The Mac! Former Child Star Macaulay Culkin Joins Rocker Adam Green Onstage For Rousing Beach Boys Cover

The actor was a surprise guest at the show in Bristol earlier this week

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Macaulay Culkin stunned fans at recent gig when he climbed onstage for a 'mindblowing' duet with rocker Adam Green.

The 32-year-old actor – best known for his role as cherubic Kevin Mcallister in the Home Alone films – made an impromptu appearance at one of Green's concerts at Thekla in Bristol for a rendition of Beach Boys classic Kokomo, much to the amazement of eyewitnesses.

“so surreal! Im pinching myself it was an ace gig. But this made it something else! (sic)” tweeted @BigJeffJohns following the show on Thursday (April 11).

Rocking out: Adam Green onstage with special guest Macaulay Culkin (Twitter/Jeffrey Johns)

Macaulay made the surprise appearance at former Moldy Peaches frontman Green's show after original guest Bikini Shapiro – who worked with the 31-year-old singer on a self-titled album of duets – pulled out with an illness.

“Macaulay Culkin was a special guest,” Daniel Fowler, who attended the show, later told NME. “Adam came onstage and said he was sorry that Bikini couldn't make it. But he said that for the encore we'd have a special guest.

“Then Macaulay Culkin came on for the last song and sang with Adam was OK. Adam was carrying the lead vocals. I think Macauley's mic wasn't quite as loud, but it sounded OK.”

The actor – whose long-term relationship with Mila Kunis came to an end in 2011 – had previously collaborated with Green in experimental film The Wrong Ferrari.

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Macaulay Culkin as 'Kevin' in Home Alone (WENN)