The mother of Victoria Beckham, better known as Posh Spice, is letting guests at her grandchildren's christening know they must dress modestly.

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In particular, Jackie Adams has advised female guests that she will not tolerate cleavage at a time when her daughter, expecting her third child in March, is feeling a bit insecure about her own figure, the Daily Mail reported Wednesday.

Brooklyn and Romeo Beckham will be christened Thursday evening at a private chapel on the glamorous couple's Hertfordshire estate near London.

A guest of the affair says Victoria worries about being something less than the center of attention.

"The last thing she would want is some of her more glamorous friends appearing dolled up to the nines. It is her big event and she wants to be the star of the show," a guest told the newspaper. "She doesn't want to be made to feel uncomfortably drab compared to people like Elizabeth Hurley or even Wayne Rooney's girlfriend, Coleen.

"This is a huge thing for Victoria and David. She keeps on saying that it is to show the world that 'Brand Beckham' is back on track and she thinks it will be her finest hour."