Robbie Williams has celebrated his fifteenth anniversary with wife, Ayda Field Williams , with a grand romantic gesture.

Robbie, 51, was performing in Stockholm, Sweden, for his BRITPOP Tour when he enlisted the crowd's help to serenade Ayda for the couple's wedding anniversary.

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Dressed in a monochromatic red outfit, Robbie and the crowd of 30,000 sang the tune of Happy Birthday to "Happy Anniversary" while Ayda films.

"Awe," Ayda wrote on the clip. "You romantic t***."

© Instagram Robbie enlisted the crowd's help to

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