Beyonce has made hubby Jay-Z one happy man, and after seeing this GQ cover, we're pretty happy, too!

The sexy songstress is gracing the cover of February's 100 Sexiest Women of The 21st Century issue.

Although we know Beyonce worked out hard to get this tight bod, she credits her slim-down to breast-feeding daughter Blue Ivy ... who was born just last year.

Beyonce has been confirmed as a performer for the 57th Presidential Inauguration taking place later this month. We have a feeling she won't be wearing this!