The Loose Women presenter stars as sexually-liberated therapist Dr Andrew Grey opposite Hollyoaks actress Christina Baily in the upcoming gangster movie A Landscape of Lies.
"I had to do scenes that took me out of my comfort zone and I loved it," McLean told Closer.
"It feels liberating to reinvent myself - this is going to be my best year, after such a rubbish time."
She added of her kissing scene with Baily: "I had to neck half a bottle of Jack Daniel's to get over my nerves!
"Christina was lovely and we got it over with quickly, but it was funny how all the male crew suddenly appeared!
"I had to kiss a few guys in the film, too, which was odd, as I've only ever had two boyfriends - and I married both of them!"
Of her Closer photoshoot, McClean said: "When I was younger, sexy shoots like this filled me with dread, but now I think, 'Why not?'
"I'm growing in confidence and feeling more adventurous since my split."
The full feature appears in this week's Closer magazine and McLean's Diamonique jewellery range is available exclusively to QVC.