Heidi Montag, Spencer Pratt

Spencer Pratt is hoping his 12-hour detainment in a Costa Rican airport will bring him and estranged wife Heidi Montag back together.

"It was clear we're soul mates. I don't see any reason we can't get back on track," Pratt told The Associated Press.

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Over the weekend, the couple was held in Costa Rica after security officers found two unloaded handguns in their luggage.

Pratt, 27, was coming back from a jungle retreat for "self-improvement" while Montag, 23, stayed at a villa nearby. They maintained that that the guns were for protection as they travelled to and from Costa Rica by private jet. Although they hadn't declared the weapons and had no permits with them, the Pratts were released after questioning and allowed to return to the U.S., police told the AP.

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"As far as I'm concerned the last thing in the world after everything we have just been through is to go through with this divorce," Montag said.

In July, she filed for divorce. The couple married on their reality show The Hills.

Upon their return to California together, Pratt asked Montag if he could join her at a fundraising walk for cancer and she agreed, the AP reported. And noting that that Wednesday is Montag's 24th birthday, Pratt said he hoped to use that as a chance to "sweep her off her feet."