Sources tell the 32-year-old and her Scorpion co-star Elyes Gabel separated last month (Jun16).

"It was an amicable split," the insider said. "They're still friends and work together almost everyday. They still love each other but just couldn't make things work."

The former American Idol runner-up was previously married to Nick Cokas. The couple's five-year union ended with a separation in 2013, before MCPhee filed for divorce the following year (14).

News of their split came seven months after Katharine was photographed kissing her married Smash director, Michael Morris. Her divorce from Cokas was finalised in February (16).

Representatives for MCPhee and Gabel have yet to confirm or deny the split reports.