Mariah Carey and Nick Cannon celebrated the upcoming arrival of their twins at a blue-and-pink themed baby shower Sunday night at The Conservatory Grill at the Montage Hotel in Beverly Hills, PEOPLE reported. The elegant baby shower was adults-only.

Carey and Cannon arrived at the party at 7PM and were joined by family and friends, including 'American Idol' judge Randy Jackson.

The shower was decorated with pink roses, blue hydrangeas and pink and blue balloons in honor of the little baby boy and girl they are expecting. Guests brought presents wrapped in pink and blue also.

"Mariah had the best time at her shower," a source tells PEOPLE. "She was very touched by how nicely everything turned out and excited about all the generous gifts she received. She has been feeling a bit tired and worn out lately, but the shower was an event that she really enjoyed and that made her very happy. Now she can't wait to meet her baby twins!"