"I'm in New York having a ball," a smiling Tina Knowles Lawson says in an Instagram video posted Saturday night

By Kathy Ehrich Dowd
June 18, 2017 10:49 AM

Tina Knowles Lawson is so far keeping mum about her new grandchildren, but one thing’s clear: She’s really happy.

Beyoncé‘s mom even posted a short video to Instagram Saturday night that proved it.

“Hi, I’m in New York having a ball,” she says in the clip before flashing a wide smile and waving at the camera.

She captioned the video “In New York for my friends son’s wedding ! God lets things happen in his time not ours! Don’t try to rush him!”

She posted around the same time that a source confirmed to PEOPLE that Beyoncé and Jay Z welcomed their twins.

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Lawson, 63, was clearly in a celebratory mood this weekend. On Friday night she and her husband of two years, Richard Lawson, enjoyed a night out on Friday, donning ’70s duds for a disco-themed bash to celebrate friend A.C. Collins’ birthday.

In April, Lawson told reporters she was “so excited” for the twins’ arrival: “I can’t wait.”

She also praised Beyoncé for the way she’s parented daughter Blue Ivy, 5.

“She’s a really good mom,” Lawson said at the time. “Really patient and kind.”

While Laweson hasn’t commented on the twins’ arrival, her ex-husband (and Beyoncé’s father) Mathew Knowles shared the news on Twitter on Sunday.

“They’re here! #beyonce #twins #jayz #happybirthday,” he wrote on Twitter. He included a shot of a photo of balloons that was signed “love, granddad.”