Rachel, 27, announced that she was joining Strictly using Countdown's famous letterboard, spelling out the phrase "I am on Strictly".
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"I can't wait @BBCStrictly!" tweeted Rachel. "Been getting tips from Strictly old boy @MarkFosterSwim this week, says I need more work!"
Essex-born Rachel, who studied maths at Oxford, married her university sweeheart Jamie Gilbert on 11 August 2011.
Amongst those in attendance at Rachel's Suffolk ceremony was her fellow Countdown presenter Nick Hewer who exclusively told HELLO! "Of course, Rachel is one of the most beautiful women in England.
When you've got brains and beauty combined, then you've hit the jackpot – at least Mr Gilbert has."
Radio 2 presenter Vanessa Feltz caused a stir on Thursday when she was the revealed herself to be the first celebrity to join Stricly's 11th series.
Other stars who are rumoured to be joining Vanessa, Tony and Rachel in the battle for Strictly's glitterball trophy include rugby player Ben Cohen, designer Julien Macdonald, singer Sophie Ellis-Bextor, model Abbey Clancy and Hairy Bikers cook Dave Myers.