Peak-a-boo….we see you!

Mary Kate Olsen makes a futile attempt to hide her face as she leaves a furniture store in Los Angeles on Mondya.

The 21-year-old actress, who was rocking a grunge look with torn skinny leg jeans and a big oversized black fur vest, looked like she was staying healthy after a brief stint in the hospital drinking what looks like fresh-squeezed carrot juice.

This is a monumental occasion for a self-professed Starbucks addict!