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OTRC: Victoria Beckham: Justin Bieber confused my son with Angelina Jolie's Pax

David Beckham and Victoria Beckham arrive at the Vanity Fair Oscar party on Sunday, Feb. 26, 2012, in West Hollywood, Calif. ( AP Photo/Evan Agostini)

Victoria Beckham says teen pop sensation Justin Bieber appeared to confuse her son for another famous celebrity child.

Beckham, 37, told Vogue magazine in an interview published in its April 2012 issue that she and her husband David had a surprise for their second-oldest son Romeo, 9, for his birthday - they took him to hang out with Bieber in his studio while he was recording his Christmas album, "Under the Mistletoe."

She said the singer later sent him and her other sons signed guitars but the instrument that was meant for Romeo was addressed to "Pax."

"So we got one of the Jolie-Pitts' guitars," Beckham joked, referring to the Vietnamese son of Angelina Jolie and Brad Pitt, one of the celebrity pair's six children.

The Beckhams have three sons, Romeo, 13-year-old Brooklyn and 7-year-old Cruz. They welcomed daughter Harper Seven on July 10, 2011. The two married on July 4, 1999, in Ireland four months after Beckham gave birth to Brooklyn.

The Spice Girl and designer also talked to Vogue about her dedication to her children, while her husband explained why he doesn't attend her fashion shows.

"Usually I'm a calming influence, but I think it's nice for her to just concentrate on that," David Beckham told Vogue. "You [Victoria] put so much pressure on yourself," he told his wife.

Beckham recently launched a new fashion line called Victoria by Victoria Beckham. The fashion icon was a member of the girl group, the Spice Girls, and was known as Posh Spice. Her fellow bandmate, Emma Bunton, aka "Baby Spice," welcomed her second child in May 2011.

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