It appears the passion that Cara Delevingne and girlfriend St. Vincent share may have been a little too difficult to control on the pair's recent flight from Los Angeles to London.  

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According to The Daily Mail, the two were spotted being amorous on their transatlantic flight over the weekend before disappearing into the back of the plane for 15 minutes and emerging with disheveled appearances afterwards.  

"The girls were really PDA-ing. They couldn't keep their hands off each other while they were kissing, and it set the other passengers' tongues wagging," an eyewitness told the publication, before noting how the 23-year-old actress and model and 32-year-old musician looked after they returned to their seats.  

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"They didn't manage to creep in there too discretely, as loads of people saw," the source said. "Eyebrows were raised throughout the cabin, and some of the crew seemed awkward, but nobody disturbed them. Fifteen minutes later, they reappeared, looking pretty disheveled before sitting back down in their seats." 

Neither has commented on the reports. 

The couple are believed to have begun dating late last year, though Delevingne didn't confirm the romance until earlier this year, when she finally confirmed she was bisexual in a Vogue interview, mentioning her girlfriend and crediting her love for her with helping her be confident in who she was. 

"I think that being in love with my girlfriend is a big part of why I'm feeling so happy with who I am these days," she said at the time. "And for those words to come out of my mouth is actually a miracle." 

Tags: cara delevingne st. vincent