Victoria Beckham admits she fretted over what to wear to the Royal Wedding.

The Fashion designer and her soccer star husband David were invited to the high-profile nuptials of Prince William and Kate Middleton last April and while they were flattered to be asked, Victoria was unsure about her outfit because she was heavily pregnant with daughter Harper at the time.

Victoria - who also has three sons, Brooklyn, 13, Romeo, nine, and seven-year-old Cruz, with David - told America's Vogue magazine: ''First, obviously, we were very, very excited. But what do you wear to the biggest wedding ever - when you're enormously pregnant?''

In the end, the former Spice Girls singer opted for a navy blue billow dress from her own collection, teamed with a Philip Treacy pillbox hat and pair of Christian Louboutin heels.

As well as mixing with real royalty, the Beckham family have also grown close to Hollywood royalty and have a struck up a close Friendship with Justin Bieber.

Justin met the Beckham boys as a treat for Romeo's birthday but when he sent them a signed guitar each, the 'Baby' singer gave Romeo one meant for Brad Pitt and Angelina Jolie's son, Pax.

Victoria said: ''For Romeo's birthday, as a surprise, we took him to hang out in Justin Bieber's studio while he was recording his Christmas album. He sweetly sent the boys signed guitars afterwards, but Romeo's was signed to 'Pax'. So we got one of the Jolie-Pitts' guitars.''