Only her hairdresser knows for sure.

Duchess Kate erased her few grey strands with a session at a London hair salon that cost nearly $1,000 and lasted hours, according to new reports in the Britishmediaand inVanity Fairmagazine.

But eager royal scribes could barely see the results tonight when she andPrince Williamattended the annual white-tie Diplomatic Reception atBuckingham Palacehosted byQueen Elizabeth II.

The palace did not announce it in advance and then declined to release pictures. Plus, she turned up wearing a diamond fan-motif tiara, formerly owned by the late Queen Mother, that covered up the top of her half-up, half-down hairstyle.

A hasty paparazzi snap of the couple leavingKensington Palacein a chauffeured Bentley showed only aglimpseof her cream lace bespoke gown byAlexander McQueen.

It was the first time she had donned a tiara in public since her wedding day in 2011. She wore stunning diamond drop earrings, too, according to tweets by royal reporters on the scene.

It also was the first time the couple had attended the annual Diplomatic Reception, when representatives of more than 170 foreign embassies in London are invited to mingle with the queen. Now that the couple are stepping up their schedule of royal duties, this is the sort of official event they will be doing more often.

Meanwhile, Katie Nicholl of theMail on Sundayand and Rebecca English of theDaily Mailhave been hot on the story of what the duchess did to banish those embarrassing grey strands that were showing in her part when she did an outdoor engagement last month.

As a busy new mom who's also breastfeeding four-month-old Prince George, she didn't have time to make it to the salon and has tried to avoid toxic chemicals. But she went to theCentral Londonsalon/spa of Rossano Ferretti and emerged six hours and $984 later with her hair cut, conditioned and colored, her grey gone, Nichollreported.

Closeup views of the hair makeover may be better on Thursday night when she and William take to the red carpet for the premier ofMandela: Long Walk To Freedom.

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