Drew Barrymore and Gossip Girl star Ed Westwick were spotted “in a full-on make-out session” at a NYC concert for alt-rockers Kings of Leon Tuesday night.

Westwick’s co-star Chace Crawford was also with them in the V.I.P. area at Webster Hall, but contrary to blog reports, he was not kissing Barrymore.

After the concert, Barrymore, 33, and Westwick, 21, took their PDA to Bowery Electric, according to New York’s Daily Intel.

It is the second time in a week that Barrymore and Westwick locked lips, another source tells Us.

They were spotted chatting this past weekend at a Saturday Night Live after-party, which The Kings of Leon also played.

“Chemistry was there!” a witness tells Us of the two.

They then headed to NYC’s hip Fat Cat Billiards, where they stayed until 6 a.m., shooting pool with Gossip Girl cast members (including Crawford), actress Ellen Page and Emile Hirsch.

“Drew was hanging all over Ed!” a witness tells Us, denying more reports that she had also smooched Crawford. “They were full-on making out!”

Adds the witness, “They were definitely all over each other. It was on!”

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