Are trust issues getting the best of Kristen Stewart and Rob Pattinson's relationship?

Hardly! In fact, Rob proves to have a pretty great sense of humor as asked Kristen to take a lie detector test in response to recent rumors about her and other guys, according to The Sun.

However, it was all part of an elaborate prank that Rob was pulling on her, and Rob is not actually suspicious of Kristen at all!

This all started when rumors swirled last week that Kristen Stewart was seen in a car with director Rupert Sanders, whom she spent a little too much time with last summer.

However, when Rob saw the photo, he realized that it was actually just a valet at a local restaurant who was parking Kristen's car, and whom Rob is friendly with.

So Rob decided to have a little fun with the situation.

He left a fake message on Kristen's phone about him having set up an appointment with a lie detector specialist, and he asked Kristen to take the polygraph exam to prove she was telling the truth about not meeting with Rupert.

“He just laughed when someone showed him those pictures – he knows the valet well and thought he would have some fun by setting up a lie detector test then asking Kristen to take part,” a source reveals. ”Luckily, she saw the funny side of it.” 

And it sounds like fans of the couple have nothing to worry about.

“Kristen and Rob have been getting along brilliantly recently,” the source adds.

Phew! We have to admit that this prank is hilarious, although it seems a bit risky, since it could have caused a heated argument between the two. Luckily, they both seem to have a great ability to laugh at the rumors that surround them.

Who knew Rob was such a prankster?

Source: The Sun via Hollywood Life

Credit: Hollyscoop via 5min Photo: Robert Pattinson Was Out With Katy Perry During Kristen Stewart’s Car Accident