Their relationship caused shockwaves because they seemed like one of the most unlikely Hollywood couples, but Zac Efron and Michelle Rodriguez reportedly have something great in common, and the actor reportedly adores Rodriguez's free-spirit.

Michelle Rodriguez and Zac Efron Just Hooking Up?

According to Yahoo News, the two actors, who bonded over past experiences including rehab stays, have grown closer as a result-and are together because of their commonalities.

"They're so comfortable with each other-that's why it started," an insider said. "They've bonded over the problems they've had in the past and were there for each other when they had break-ups. Michelle gets what Zac's still going through and doesn't judge him. They also both love motorcycles, hanging out and being sporty-it just works. He doesn't care that she's bisexual. If anything, he loves how free she is."

Michelle Rodriguez and Zac Efron 'A Good Influence' On Each Other?

The two reportedly began hooking up in early June, soon after Rodriguez's relationship with 21-year-old model Cara Delevingne fizzled out.

"They started hooking up on 12 June, at the after-party for The Rover," the source added. "They were flirting and that's when things moved to the next level."

Reportedly, the bond the two share has helped their relationship escalate quickly, as photos which surfaced over the July Fourth weekend that showed them making out on a friend's yacht in Italy seemed to suggest.

The two have reportedly hooked up on and off since 2011, and have known each other for years as well, adding to the strength of their bond.

"They're infatuated with each other, partly because, they've known each other for such a long time," the source said.

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Michelle Rodriguez, Zac Efron