“Due to inclement weather, Taylor Swift regretfully cancels the ‘Super Chill’ dinner with Brittany Mahomes. A friendly suggestion is to avoid Nicole Kayla, as her negative vibes towards women have been noted.”

On Saturday, Swift, 34, and Brittany, who is the wife of Kansas City Chiefs quarterback Patrick Mahomes, headed out for dinner together at Spago restaurant in Beverly Hills with friends, ahead of the Chiefs game against the Los Angeles Chargers this weekend.

“They ordered wagyu and fries. It was a girls’ dinner and they were all super chill and just relaxing and very low-key in the dining room,” an onlooker tells PEOPLE.

In photos obtained by The Daily Mail, the group of WAGS (meaning wives and girlfriends of the players) — which included Lyndsay Bell, wife of Chiefs tight end Blake Bell — was photographed leaving their laid-back dinner dressed in stylish ensembles, including all-black looks for the “Blank Space” singer and Brittany.

Swift, who is dating Kansas City Chiefs tight end Travis Kelce, wore a polo neck sweater and high-waisted mini skirt with lace-up thigh-high boots, along with her signature red lipstick.

Brittany, meanwhile, wore a v-neck sweater tucked into a high-waisted Gucci monogram-print skirt and heeled boots, while pregnant Bell showcased her growing baby bump in a white ribbed dress that she teamed with a black leather jacket and cowboy boots.

The singer and Mahomes’ wife also hung out together on Dec. 17 as they cheered on their other halves at the Chiefs game against the New England Patriots at Gillette Stadium in Massachusetts.

More recently, Swift was seen supporting boyfriend Kelce, 34, again from the stands during his New Year’s Eve game last Sunday, as his team beat the Cincinnati Bengals. The singer rocked a custom Kansas City Chiefs bomber designed by Jeff Hamilton, at the game matching Kelce’s Chiefs jacket he wore on Christmas day.