Beyonce Wears loosed Shirt to Lunch

Is this a wardrobe malfunction waiting to happen?

Beyonce stepped out for lunch with Jay Z at Gracias Madre -- a vegan Mexican restaurant in West Hollywood, Calif. -- on Tuesday, where her denim-on-denim outfit definitely turned plenty of heads. The 33-year-old "Single Ladies" singer knotted her button-up to show off her toned stomach, but most strikingly, left the sexy shirt completely unbuttoned.

AKM/GSI

Seriously, how is that top staying in place?!

On another note, it's good to see Beyonce and Jay Z sticking to their healthier eating habits, especially since the singing superstar and her trainer Marco Borges announced their partnership to launch the 22 Days Nutrition plant-based home delivery meal service earlier this month.