The 44-year-old actress loves watching the clippings of the English journalist and TV documentary-maker, reported Daily Star.
"Jen loves watching clips of Louis on the Internet. They've actually only met a couple of times, but she was hanging on to his every word," a source said.
"Now Jen keeps telling Justin that when they marry she wants Louis to make a speech. Justin jokes that he feels threatened by her obsession...," the source added.