They might not be walking down the aisle anytime soon, but it looks like things are going pretty well for Hollywood couple Jennifer Aniston and Justin Theroux. According to sources, the actor made his fiancée "squeal with delight" when he recently surprised her at work.

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The couple, who have been dating since 2011, have not made any public comments about their upcoming wedding, but seem to be doing well in their relationship by spicing things up and surprising each other when they least expect it. Theroux visited Aniston on a photo shoot with her business partner Chris McMillan just last week.

"Justin actually showed up as a surprise to Jen," a source tells Us Weekly. "He turned up a couple of hours into the shoot. She was nearing the end of the shoot when he snuck in to say 'Hi.'"

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The source added, "She clearly wasn't expecting to see Justin because she squealed when he showed up. They hugged and he gave her a kiss and then he watched the end of the job."

Just recently, the couple got another rather odd surprise. According to the Toronto Sun, their friend Cheslea Handler recently invited the Hollywood couple over to her home for dinner but when they declined to visit, the funny woman sent them a pizza with one of her hair extensions in it.

Theroux returned Handler's hair during a recent taping of her show, and said, "Chelsea sent that up to our house with a pizza. We didn't know who it was from. Our doorbell rang and there was a pizza delivered to our house and we opened it up and it was an extension pizza."