Beyoncé departs her office building in NYC...

This chick is clearly up to something.

Beyoncé was spotted yesterday looking very fine and Springy in a plunging denim romper by Stella McCartney.

Her chic appearance comes after Tina Knowles Lawson penned a touching Mother's Day letter in honour of her daughters Beyoncé, Solange and Kelly Rowland.

More hot pics inside.