The HBO darling, 27, was spotted with a small group of friends in the VIP section of the Troubadour in West Hollywood Wednesday night “laughing, clapping and pointing out her man’s antics,” a source tells PEOPLE.
“She stood almost the entire time,” the source continued. “She bopped her head and occasionally pointed to the stage and whispered in her friends’ ears with a big smile on her face as though she was so proud of her man. It was clear she was focused on him the entire night.”
At one point, she had her arm around a male friend as Antonoff, 29 – who was fronting his latest side project, the new band Bleachers – sang a cover of Tom Petty’s “Don’t Come Around Here No More.”
As the show neared its end, the Fun. guitarist sang the ballad “Who I Want You To Love,” a song Dunham clearly knows well: she sang almost every lyric.
Later, Dunham screamed along with the crowd, clapped and smiled as her rocker boyfriend closed his show with his single “I Wanna Get Better.”
“Proud as heck of this guy, who brought down the house at The Troubadour tonight #bleachers,” Dunham wrote on Instagram with a cuddly photo of her with Antonoff.