The former Lizzie McGuire star let her hair down at a pre-Grammys party held in Los Angeles on Thursday night (23 January).
Hilary's wedding ring was noticeably missing from her hand.
The blonde actress looked in good spirits, however, smiling and laughing as she posed on the blue carpet at Soho House at the bash hosted by Delta Airlines.
26-year-old Hilary announced her separation from hockey player Mike earlier this month. The couple are parents to son Luca, one.
At the time she said they will remain "best friends" and continue to support each other, later adding on Twitter: "Mike and I are sitting here, we are so appreciative for all of your kindness & well wishes. Not an easy day but we're getting thru it together (sic)."
Hilary and Mike met while holidaying in Idaho. They became engaged during a stay in Hawaii in 2010 and then married in Santa Barbara, California later that year.
Hilary has been back in the recording studio in recent weeks working on a follow-up to 2007 album Dignity.
She recently told the Winnipeg Sun that artists like Taylor Swift inspire her. "She's really honest with her lyrics and her stage show isn't like some crazy thing that's controversial. But I think what Miley Cyrus is doing is really cool and I think she's being who she wants to be and that is important. And so I respect that."
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