Giuliana and Bill Rancic Celebrate at a Blue Baby Shower

Bill and Giuliana Rancic
It was a blue Father”s Day for Giuliana and Bill Rancic – literally.

Before officially announcing that they are expecting a boy, the couple broke the news in a very special way to guests at their baby shower Sunday afternoon.

Blue and pink balloons filled the room at the private home in a gated Beverly Hills community. The big reveal: Giuliana – in a yellow dress – and Bill released a set of blue balloons into the sky to the cheers of partygoers, a source tells us.

About 100 people, including Lisa Ling, Melissa Rivers and George Katsopolis, helped the couple celebrate at the shower, thrown by Giuliana”s manager Pamela Kohl.

“Such a blast!” Tweeted the E! News host, who was diagnosed with breast cancer in 2011.

Younger guests crafted, swam and played in a bounce house, as a camera crew filmed the gathering for the couple”s reality show Giuliana & Bill. Another party activity: a make-your-own perfume bar.

And it looks like the little Rancic is one lucky guy. Among the gifts: three strollers and a bassinet. (The couple, who announced in April that they would welcome a baby via a gestational surrogate, also registered for plenty of monkey-themed goods from Bel-Bambini boutique.)

But no one left empty-handed. Guests were treated to gift bags with Tory Burch sandals, Mabel”s Labels Bag Tags and a Kai candle.