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James Marsden, Edei, Skybar

Martin Lambert, Mondrian Los Angeles and Skybar

James Marsden and Edei are making beautiful music together.

The 42-year-old X-Men actor, who stars in the new HBO series Westworld, grabbed an acoustic guitar and joined the 27-year-old British soul singer, whose real name is Emma Deigman, onstage at her gig at the Skybar club at Mondrian Los Angeles earlier this week. Marsden and Edei performed a duet cover of Ed Sheeran's "Thinking Out Loud" and the ultimate song of seduction, Marvin Gaye's "Let's Get it On," E! News has learned.

The set was presented by the Recording Academy's MusiCares Foundation to celebrate the closing night of the Defiantly Inspired photo exhibit in the lobby of the hotel.

James Marsden, Edei, Singing

Martin Lambert, Mondrian Los Angeles and Skybar

Marsden, who had also showcased his musical skills in the movies Hairspray and Enchanted, and Edei have not commented on the status of their relationship. 

They first sparked romance rumors in early September when they were spotted out and about together in New York City. Later that month, they celebrated their birthdays together at a local restaurant, where they were joined by a friend. In November, they were photographed walking together in Los Angeles.

Marsden and Edei also appeared to spend Super Bowl Sunday together last weekend, as indicated by a photo Edei posted on Instagram.

Marsden's last confirmed relationship was to ex-wife Lisa Linde. The two were married from 2000 to 2011 and share a son and daughter together. The actor also has a son with ex-girlfriend and Brazilian model Rose Costa