Robert Pattinson workout duck walk gym shorts

Robert Pattinson appeared to have been giving the inside of his car an extra eyeful after another workout in West Hollywood on Thursday.

The 27-year-old actor has been bulking up for his latest film Mission Blacklist, or perhaps for his rumored lady love Dylan Penn?

After his mini reunion with ex-girlfriend Kristen Stewart, the Twilight star and Penn reportedly attended a private party for the launch of Angie Banicki's new book 30 Before 30 at the Roosevelt Hotel in Hollywood.

Wonder which way he's leaning?