Lindsay Lohan and Calum Best's romance is heating up

Lindsay Lohan must be really serious about her boy du jour, Calum Best. She posed for pictures with her mother and the British reality TV star at the party celebrating her Nylon magazine cover on Wednesday night. The event, which took place at Lindsay's (and Britney Spears's) new favorite NYC nightclub Tenjune, was DJ-ed by Lindsay's friend (and rumored lover) Samantha Ronson. Is three a crowd?

Lindsay originally hooked up with Calum during a visit to London last year, but the pair were spotted together again earlier this week in New York. Calum's meeting with Lindsay's mom Dina, appeared to go smoothly. A witness told British newspaper, the Sun, "They seemed to be getting along very well. Calum, Lindsay and Dina all squeezed together when they posed for pictures."

Samantha didn't show any signs of jealousy as Lindsay kissed Calum in her private booth. But the popular DJ did spin Amy Winehouse's "Rehab" in an apparent homage to her fiery friend. Lindsay performed a rendition of the song several weeks back during another one of Samantha's gigs. She smiled at her Samantha's gesture, reports People magazine.

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