Checking off some items on her to-do list, Kristen Stewart made her way to an office building in Beverly Hills, CA on Thursday (June 13).

The newly-single "Twilight" actress sported her usual casual ensemble as she trekked past the awaiting mob of photographers in skinny jeans, sneaker and sunglasses.

In other news, it looks like Kristen may be feeling a bit of jealousy over her ex, Robert Pattinson's, close relationship with mutual friend Katy Perry.

Friends of the actress who spoke with the Daily Mail explained that Stewart feels "incredibly down right now" and "betrayed" due to the rumors that Perry and Pattinson made be heading towards a relationship.

And for all the Twihards out there hoping for a reconciliation, it doesn't look too good, as they added, "Kristen is in a certain state of denial. She can't let go of Rob or get over him. She keeps trying to contact Robert and find out what he is doing but her attempts to see Rob have been rebuffed. Rob is not responding to her."