Robert Pattinson Cheating On Girlfriend Riley Keough And Dating Sia? 'Twilight' Actor Spotted In Hollywood On Multiple Nights With Australian Singer

Is Robert Pattinson cheating on his girlfriend Riley Keough and dating Australian singer Sia? A source denies the rumors and says Robert and Sia are just friends.

The 27-year-old "Twilight" actor has been seen out in public with the 37-year-old Australian songwriter a number of times recently, The Belfast Telegraph reports.

"[There's] definitely nothing romantic," a source insisted to E! News.

The pair hung out on Tuesday at Soho House in Los Angeles, California, after having a night out at the Jay-Z and Justin Timberlake Legends of the Summer concert.

"[Robert] was equally engaged in a conversation with the entire group of people," the source continued. "Nothing about Rob and Sia came across as romantic."

According to Entertainmentwise.com, Sia and Rob were sitting next to each other but weren't overly friendly towards one another.

This is good news for Riley Keough, the 24-year-old granddaughter of Elvis Presely who has been linked to Rob Pattinson, with some even calling her his new girlfriend after his break up with Kristin Stewart.

However, a source told HollywoodLife.com that their relationship isn't very serious, and can be better described as "friends with benefits."

"Rob will probably be seen with other girls along with Riley," the source said. "He generally considers himself both single to his friends and exclusive when he is with Riley. It's getting very physical between him and Riley, but he still isn't ready to pull the trigger on a full relationship as he will be away filming soon and he doesn't want to ruin something that is blossoming by leaving. He is aware that something still might happen, but he is being cautious. But with a strongly physical relationship that is happening, he knows that can always lead to more, so his mind is everywhere."