Stylist to the stars Rachel Zoe has been staying quiet about the gender of her second child; but one of the guests at her baby shower Sunday (Nov. 10) let it slip that she's expecting a boy!

The excited guest posted a picture on Instagram of the scene at the shower and revealed silver, green and metallic "B" "O" and "Y" letter balloons. They added the caption, "Insanely beautiful shower honoring [Rachel Zoe]!"

The mom to be also posted a few pictures on her Instagram account. One with a group of friends along with the caption, "My team celebrating with me at my baby shower, love them!"

While Zoe has yet to confirm the news, an insider told Life and Style magazine in an article published on Aug. 14 that she was having a boy as well.

"She has been telling everyone that she's having a boy -- all her clients and friends know. She was joking that she really wanted a girl to take to couture shows and turn her into a fashionista!"

Zoe and her husband Roger Berman already have one boy, 2-year-old Skyler.

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Rachel Zoe