Miley Cyrus poses for a Valentine's Day selfie with beau Patrick Schwarzengger

Arnold Schwarzenegger's son Patrick has shared a selfie with pop star Miley Cyrus amid dating rumours.

The stars, who are yet to directly confirm their relationship, are not shying away from showing affection for each other on social media, reported Us magazine.

While Patrick, 21, captioned the photo, saying, "Luckiest guy in the world," Cyrus, 22, posted a separate selfie showing the pair sharing a pizza slice. She captioned it, "Life can't get any better."

The duo, said to be dating since four months, attended the 2015 Grammy Awards party together.