Back together again: AnnaLynne McCord and Twilight's Kellan Lutz Go Partying

They've been keeping everybody guessing over whether they're an item. 

But last night Twilight hottie Kellan Lutz and his on-off girlfriend AnnaLynne McCord put an end to the on-off rumours of a relationship and stepped out on to the red carpet as a couple.

They were attending the World of Calvin Klein party during  Berlin Fashion Week and appeared very lovey-dovey.

Lutz, 25, is the face of the Calvin Klein X underwear campaign and has been dating 90210 actress AnnaLynne, 22, since he appeared in 90210 alongside her in early 2009.

Because of Lutz's hectic filming and promotional schedule for the Twilight Saga, the pair have hardly been seen together in the past few months but looked very much together at the party.

Dressed in a beautiful bright blue shift dress, AnnaLynne matched Kellan's navy Calvin Klein suit and blue tie perfectly. 

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