Tom Hiddleston is dating Elizabeth Olsen. Olsen, who is the sister of twins Mary Kate and Ashley recently appeared in "Avengers: Age of Ultron" as the Scarlet Witch, in which she co-starred with Tom Hiddleston who plays Loki.

Us Weekly's insider reported that the two have been dating each other recently. "They have been hooking up," the insider revealed.

Apparently, the relationship has not turned serious yet and the two are still in the getting to know each other stage.  "It's casual," the source revealed. But even though they do not want to put any labels yet on their relationship, they do keep in touch.  "[They] text when they're apart," the insider added.

Hiddleston and Olsen are long time friends. They met on the set of the upcoming musical film, "I Saw The Light," where they play a husband and wife. The two reportedly became close in the course of filming.

Olsen recently broke her engagement to Boyd Holbrook ("Gone Girl") earlier this year in January. Page Six reported that Elizabeth was spotted at a Los Angeles farmers market not wearing her engagement ring. Meanwhile, Holbrook was spotted flirting with an unknown woman at the CAA Pre-Golden Globes party.

The couple met on the set of "Very Good Girls." The movie's director, Naomi Foner witnessed the blossoming of the relationship. "We slowly saw that developing," Foner said. "It was a lovely extra little thing that came out of making such a niece collaboration.

The actress seemed perfectly happy during her engagement. "I'm relaxed about it, but I am excited and planning ideas because it's fun -- it's like throwing a party to celebrate life," she said in an interview with Marie Claire UK. "I love being in a relationship a lot."

For his part, Hiddleston was previously linked with Jane Arthy, a record producer.