Credit: Fame Pictures; Jason LaVeris/FilmMagic

Having a bad hair day, perhaps?

Matt Bellamy must've been feeling shy Thursday. The Muse frontman put a plastic bag over his head as he strolled hand in hand with fiancee Kate Hudson in north London. 

Bellamy, 33, was able to see through a hole poked in the Tesco bag. Hudson, 32, did her part to stay incognito with sunglasses and her sweatshirt hood pulled up over her head.

When asked on Twitter why he had been taking pictures of paparazzi, Bellamy replied: "Building a case. Need evidence to get injunction." 

The couple, who welcomed baby Bing in July, were all smiles earlier in the week while taking the infant for a walk.

Hudson confirmed her engagement to Bellamy in April. She has a 7-year-old son, Ryder, from her previous marriage to Chris Robinson.