Miley Cyrus and Liam Hemsworth have seemingly sung their “Last Song,”and new details about the couple’s split are surfacing. According to sources, 20-year-old Hemsworth may have been stepping out on Cyrus, who has been focusing on her career.

E! News reports that earlier this month, Hemsworth was seen flirting with admirers at a party in Newport Beach and hooking up with another young woman while partying in Huntington Beach during the US Open Surf Competition. Cyrus, 17, has been in Detroit filming the flick “LOL.”

“Ever since she left for Detroit, Miley has been super focused on her work,” a source described as an “insider close to the former couple” told E! News. “Liam wanted more, but she’s 17 and has other priorities right now. He’s been a distraction. [Miley's] not with anybody else.”

Despite that assertion, rumors are now circulating that Cyrus may be spending quality time with co-star Adam Sevani. A photo of the pair allegedly hanging out on the set of “LOL” has circulated, although it is unclear if it is actually Sevani in the picture.

Hemsworth, who was seen hanging out alone at a Dave Matthews Band concert earlier this week, has reportedly visited the set of “LOL” twice. “Both visits were only about 24 hours in length — by Miley’s choice,” the insider told E! News. “She is not ready to settle down, and Liam’s not a happy camper.”

Breakup rumors have plagued the duo in the past, and they have been denied by Cyrus. And E! News’ source said that the couple may not be completely over just yet: “They’re both young. To say they are done forever would be premature, but it’s safe to say for now they are doing their own thing.”

However, Hemsworth’s rep . Cyrus’ refused to comment.