Robert Pattinson and Kristen Stewart's bid to end reports about their secret romance has taken a turn for the worst - the couple was spotted kissing outside a screening of their Twilight sequel.

The two stars reportedly spent the night together at Hollywood's Chateau Marmont hotel last week - before breakfasting and attending a screening of The Twilight Saga: New Moon nearby.

And that's when things started heating up, according to UsMagazine.com.

A source tells the publication, "Rob wanted a cigarette so he went outside with Kristen for about 15 minutes. They were hugging, as Rob was smoking his cigarette, and then he leaned down and kissed her on the lips. He had his arm around her almost the whole time."

The new story comes just days after an upcoming Pattinson Vanity Fair magazine article, in which he insisted the two stars were just "friends", hit the Internet.

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(This news article provided by World Entertainment News Network)