Gwen Stefani and husband Gavin Rossdale join Roger Federer's family and friends to cheer on the tennis champ at the US Open. The rock stars joined Mirka Federer (pink cardigan, Roger's wife), Lynette Federer (green sweater, Roger's mum) and Robert Federer (red baseball cap, Roger's dad) to watch the Swiss superstar defeat Austria's Jurgen Melzer in straight sets on the Arthur Ashe Stadium at Flushing Meadows.
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Gwen Stefani Bright Nail Polish

Only Gwen Stefani could rock neon yellow nails.
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