Beyoncé, 33, was first to arrive with her three-year-old daughter, US Weekly reports. Once inside, she spent one-on-one time with Blue, who was keeping herself entertained by making "bird noises", an onlooker reported.
Beyoncé and Kelly Rowland recently enjoyed a day out together with their families
It wasn't long before mother and daughter were joined for lunch by Kelly, Tim Witherspoon and their two-month-old son Titan, as well as Beyoncé's husband Jay Z.
Once the group had settled on the outdoor patio, Beyoncé held the little boy, while Blue gently played with him, the insider reported. "Kelly looked casual and fab in jeans, boots and a grey sweater," the source said of the new mum, adding, that Beyoncé looked "stunning" in a pink, long-sleeved dress, and was very "sweet" and "mummy-like" with the children.
Kelly, 33, welcomed her firstborn on 4 November, and her Destiny's Child bandmate was one of the first to share the happy news.
Beyoncé was among the first to celebrate the arrival of baby Titan
"There's no better feeling than holding my beautiful nephew," Beyoncé wrote, next to the very first photo of little Titan. "I thank God for the honour of witnessing my sister’s journey into motherhood.
"I've always dreamt of our little ones growing up together. I'm so thankful for our bond. Baby Ty, I love you so much. Congrats to my Spoons."