The actress, who turns 46 this week, decided to kick off her birthday month with a bright-blonde bob — a total departure from her signature long, brunette waves. The major change is for her upcoming role in the action-comedy film Jolt, but it seems that Beckinsale loves the style just as much off-screen. In the past week, she's already posted five Instagram shots of her rocking the bob, including one in which she's squatting over an air conditioner to keep cool on set. (Relatable.)