The pair sat in the front row at the Rock & Republic Fashion Show, surrounded by stars including Paris Hilton and Mena Suvari.
Former Spice Girl Beckham, who created some of the denim fashions on show, gave her pal a pair of jeans she had designed to wear to the event.
It was Holmes' first public engagement since announcing she was expecting fiancée Tom Cruise's child earlier this month.
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