AceShowbiz -

No verbal confirmation has been made by both Miley Cyrus and Liam Hemsworth that they are dating, but a source has confirmed to E! News that "The Last Song" co-stars indeed are a couple. The pair is said to have been dating for more than three months.

On Tuesday, September 22, Liam was spotted attending Miley's sold-out show at the Staples Center. He was spotted among concertgoers which included Miley's friends like Ashley Tisdale and Miranda Cosgrove.

Later that night, Miley and Liam reportedly headed for a private afterparty at Katsuya, where they were said acting "lovey-dovey." The 16-year-old performer then tweeted, "Its a crazy day here at staples center. I just want everyone to have fun!!! Ahh I'm running around like a chicken with my head cut off!"

Miley Cyrus has been romantically linked to Liam Hemsworth ever since they began working for upcoming drama film "The Last Song", in which they star as love partners. Last month, rumors were mounting that they were seen kissing at Nashville International Airport. She denied the reports though. "The Last Song" itself is set for April 2, 2010 U.S. release.