Orlando Bloom

is only "friends" with Sienna Miller, according to the actor's sister.

The Lord Of The Rings star, 28, and Beyond The Sea beauty, 22, announced they

were ending their two-year relationship in January to concentrate on their

careers, but were spotted together in March.

Last month Bloom flew to Sydney, Australia to visit Bosworth on the

set of Superman Returns, where she had reportedly struck up a brief romance

with director's assistant Lundi Shackleton. Sydney newspapers claimed Bosworth used

her fling to reunite with Bloom.

After Bloom was photographed cuddling up to ex-lover Miller--only a week

after she discovered her fiancé Jude Law had cheated on her with his children's

nanny--is actress sister Samantha Bloom insists her famous brother is only in

love with Bosworth.

Samantha says, "They've been together for two years and they are still very

much together.

"Of course they [Sienna and Orlando] kissed--they are friends and he always

kisses his friends."

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