They've been married for four years.

So when Ashton Kutcher, 40, gave a sneak peek of his backside to Angelinos on Wednesday, it was nothing Mila Kunis, 35, hadn't seen before.

The couple was spotted out in Los Angeles, when the Spread star accidentally let his chinos slip down a little too far.

Cracking up: Ashton Kutcher gave a sneak peek of his butt crack to Angelinos on Wednesday.

Ashton was donning navy blue chinos that looked to be a couple sizes to large, when he made his way to his vehicle.

He was doing his best to keep things casual by sporting a white t-shirt on top with a pair of running shoes.

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The Open Season actor left his jew unshaven and his brown hair appeared uncombed. 

Letting it hang out: The couple was spotted out in Los Angeles, when the Spread star accidentally let his chinos slip down a little too far

Mila was spotted peering at her husband across the street.

The star was pulling a grey cardigan over a striped shirt and looked relaxed ina  apir of ripped jeans.

Her dark tresses were pulled into tight ponytail and she painted her lips a deep pink as she headed out on the sidewalk.

Mila has been married to her That 70's Show co-star star Ashton since 2014.

They couple began dating in 2012 and they have two children together, Wyatt Isabelle, four, and son Dimitiri Portwood, one.

What is he doing? Mila was spotted peering at her husband across the street

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