AceShowbiz -

Having a husband as hot as Justin Theroux surely makes Jennifer Aniston anxious. The "Friends" alum is reportedly always watching her husband closely on Instagram and stalking his account hard even though she doesn't have an account on the photo-sharing platform.

OK! reveals that Jennifer doesn't like to see his hubby getting too close with his makeup artist Jenn Streicher. The "We're the Millers" actress also gets jealous after knowing that the two have been popping up in each other's Instagram posts.

"Even though they weren't inappropriate and Jenn is married, it still hit a nerve with her, so she let him know," claims a source. The source goes on saying, "Justin didn't really own up to doing anything wrong, but surely he got the message."

"The Leftovers" alum seemingly doesn't want to give his wife any reason to be jealous. "The last thing he wants is for Jen to be upset," the source adds.

Jennifer and Justin began their relationship back in May 2011. They first met in 2007 on the set of "Tropic Thunder", which Justin wrote with Jennifer's close pal Ben Stiller. However, love sparked between the pair after they worked together in 2010's "Wanderlust".

The couple got engaged on August 10, 2012 before tying the knot on August 5, 2015 at their lavish Bel-Air estate in Los Angeles. "Marriage makes the small things much smaller and the big things small. It's good to have someone have your back," Justin spoke of his marriage to Jennifer to Vanity Fair.

Prior to her marriage to Justin, Jennifer underwent a highly-publicized split from Brad Pitt in 2005. The split was reportedly due to Jennifer's refusal to have children with the actor, though Jennifer later denied the allegation, saying that she "would never give up that experience for a career." The "Just Go With It" actress ended her 5 years of marriage to the "Allied" star, following the report that Brad romanced his now-estranged wife Angelina Jolie.