'Twilight' stars Robert Pattinson and Kristen Stewart are no doubt one of the hottest young couple in Hollywood these days. But, the couple is now facing a strong competition from their co-stars Ashley Greene and Joe Jonas, who are reportedly steaming up now to beat the lead pair.

The 21-year-old Joe has started dating his 23-year-old co-star Ashley Greene since July this year. But the couple is already giving a tough competition to the Robert and Kristen pairing. Initially, the cast of the 'Twilight' series used to be friends with each other and there was a friendly environment on the sets. Now, the situation has turned little lovey-dovey as the film has two real life couples and they often share some lovely moments at the sets itself. So, 'Breaking Dawn' set can be termed as Love set now.

The upcoming film 'Breaking Dawn' will have lots of sex scenes too and the stars will be shown maturing with time.

Going one step ahead, Ashley and Greene often take their love to public places. Recently, the couple was spotted at the Fresh Market, where they were enjoying shopping together. They were very friendly with the shoppers and even posed for pictures with them.

Well, it seems Rob-Kristen has a tough competition ahead. So they must come out of their covered and shy image so that they can keep their top position among the leading pairs in Hollywood!

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