Jesse McCartney steps out in Hollywood wearing a onesie and man Uggs on March 26, in Hollywood. Credit: Splash News

Maybe he was cold? Jesse McCartney stepped out in Hollywood looking blue in a onesie and Ugg boots on Wednesday, March 26.

The "Beautiful Soul" crooner, 26, appeared disheveled with his hair unkempt and a frown on his face as he walked into a Rite Aid with girlfriend Katie Peterson. Though the singer looked under the weather, rest assured he was comfortable in his pajama-like jumpsuit. McCartney's onesie featured a hoodie, which he draped over his head at one point, and several cargo pockets for easy storage. 

McCartney has actually expressed his appreciation for onesies before. Last December, a fan said she would get the singer the comfy apparel item for Christmas. McCartney replied, "You can never have too many onesies baby!"

The "Just So You Know" singer has actually been focusing more on his acting ambitions lately, taking on a new role in an untitled Amish movie opposite 78violet singer AJ Michalka, according to his fan site, via momager Ginger McCartney.

Tell Us: what do you think of McCartney's low-key look?