Angelina Jolie shows off new tattoos but it's her thin frame that overshadows the artwork

Angelina Jolieis never anything but slim and toned.

But she looked impossibly slender as she joined partnerBrad Pitton the red carpet for the premiere of his new film Inglourious Basterds last night.

The 34-year-old actress wore an unforgiving leather bandeau dress by Michael Kors, which clung to her fragile frame as she stood alongside tanned and healthy-looking Brad.

Strained: A skinny Angelina Jolie joined Brad Pitt at the premiere of his new film Inglourious Basterds in Los Angeles last night

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Slender: Angelina looked impossibly skinny in her leather Michael Kors dress

Angelina also showed off new additions to her tattoo collection - swirls around the existing body art on her arms.

Last night was Brad and Angelina's first public appearance since they walked the red carpet atCannesin May.

The couple, whose relationship has been the subject of repeated rumours in recent months, made a show of togetherness as they embraced on the red carpet.

Nice to meet you: Angelina greets Sidney Poitier

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New body art: Swirls surrounded Angelina's existing tattoos

But while Angelina was greeting everyone with a large Hollywood smile, Brad looked less comfortable.

Of course, it may well have been the stress of weeks of heavy promotional duties for his new movie, which have seen him repeatedly away from his family.

While Brad was promoting the film Angelina remained at home with Maddox, eight, Pax, five, Zahara, four, Shiloh, three, and twins Knox and Vivienne, one.

But, ever the professional, Brad patiently signed autographs for the huge crowds of fans waiting for him and Angelina.

He then led the mother of his six children through the crowd by her arm, his teeth set as he negotiated the busy red carpet.

Walk this way: Brad led Angelina through the waiting crowd

Give me a hug: The two embrace outside the Los Angeles cinema

Brad, 45, is said to be having continuing problems in his relationship with Angelina.

He has moved into a separate two-bedroom house from the rented family home they were sharing in Beverly Hills.

And reports of a rift between the two were heightened when he was spotted talking to his ex-lover Katja von Garnier at a promotional event for the film inGermany.

Welcoming committee: The couple were greeted by a huge crowd of well-wishers

A friend told Angelina he was with Katja, who he dated in 1997, and she is said to have reacted angrily when he returned to Los Angeles.

'As soon as the kids had gone to bed she marched Brad to the garden,' a source told Grazia.

'She was at breaking point and started screaming and shouting at him. It went on for nearly three hours. At one point she was punching his chest.'

Sparkling: German model-turned-actress Diane Kruger, who stars in the film, wore a daring backless dress by Atelier Versace

Red carpet ready: Actresses Christina Ricci opted for a red mini dress and Christian Louboutin pumps, while Basterds star Melanie Laurent opted for full-on glamour in a black strapless gown