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What has Kristen done to R-Patz this time?

IT appears Kristen Stewart (22) has put her foot in it again, telling her on-off boyfriend Robert Pattinson (26) something he doesn't appear to want to hear.

The pair -- rumoured to have reunited in recent weeks -- appeared on the red carpet together in Los Angeles last night for the premiere of Twilight - Breaking Dawn Part 2.

But check out the body language.

And who could blame them -- they have had a lot to contend with.

Last summer, photographs emerged of Kristen in a clinch with married Rupert Sanders (42), who directed her in Snow White And The Huntsman.

After the pictures emerged, Pattinson moved out of their home together, while the normally very private Kristen issued a public statement telling Pattinson she was so sorry, and publicly proclaiming her true love for him.

With a promo tour for the final instalment of the Twilight saga in the offing, movie bosses confirmed that the pair were still expected to tour together despite everything that happened.

The path to romance is often rocky -- and it's no different for these two Hollywood superstars.

After much speculation during the summer, the pair were pictured together in September and it is now a given that they are a couple again.

Awkwardness aside, Kristen channelled old-Hollywood glamour, her hair swept to the side with red lips and a full-length nude gown, while Rob was bang on trend in a green suit.

The premiere saw most of Hollywood's tween idols out in force.

The biggest cheers of the night came out for co-stars Robert Pattinson, Kristen Stewart, Taylor Lautner and Ashley Greene.

Tween-stars and actor sisters Dakota and Elle Fanning, and Mad Men actress Kiernan Shipka (Sally Draper) were also at the event.

And as all those Irish Twi-Hard fans know -- the flick opens on Irish screens this Saturday.