Spotted: Dianna Agron and Alex Pettyfer kissing

HOLLYWOOD - SEPTEMBER 07: Actress Dianna Agron attends the premiere of 20th Century Fox's 'Glee' Season 2 held at Paramount Studios on September 7, 2010 in Hollywood, California. (Photo by Jason Merritt/Getty Images)

Glee actress Dianna Agron has reportedly been spotted engaging in a very public display of affection with Alex Pettyfer.

According to E!, the couple enjoyed lunch al fresco the other day in Beverly Hills, but they surprised fellow diners with an impromptu makeout session.

Apparently after they finished eating, Dianna, 24, and Alex, 20, skipped dessert and instead opted for some major PDA.

An eye witness told the site: “They were full-on tonguing,” and added that once Dianna had finished “sucking face with her boyfriend,” the couple left the eatery.