Duchess Kate is 'a bit worried' about kids' behavior at Pippa Middleton's wedding

It looks as though spring has finally sprung -- for the royals, at least. Days ahead of Duchess Kate Middleton's sister's wedding, Queen Elizabeth II hosted her first garden party of the season at Buckingham Palace on Tuesday.

The Duchess of Cambridge looked as radiant as ever in a familiar baby blue Christopher Kane coat dress. And according to the Daily Mail, she chatted with Andrew Bates and his wife, Janet, about her sister's nuptials on May 20. Understandably, while she's excited about the highly anticipated event, Bates reveals that Kate is "slightly nervous" and "a bit worried about how her children might behave."

See photos from the garden party:

As we know, Prince George and Princess Charlotte will serve as page boy and bridesmaid, respectively, on Saturday -- so naturally, their mom wants their big moment to go off without a hitch. It's been reported for a while now that Kate won't be in her sister's bridal party, as to not upstage her; however, rumor has it she could be a reader.