The 35-year-old Transformers actress showed her man what he's missing, slipping her famous curves into a dangerous cut-out gown with slits exposing her leg.
All laced up in her floor-length Dundas number, Megan made every head turn when she showed up stag, serving her killer body on a platter for all to see.
Looking like the ultimate smoke show, a team of firemen couldn't put her out.
Rocking the plunging neckline that dipped all the way to her belly button, Megan matched the fire-engine red gown with a lip color equally showstopping.
Switching up her long hairdo, the Jennifer's Body actress wore her dark locks up in a bun with short bangs.
Commanding attention on the red carpet for the biggest night in fashion, Megan left little to the imagination with the best accessory of all — herself.
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Megan's solo appearance comes just hours after MGK and McGregor nearly came to blows on the red carpet of the MTV Video Music Awards on Sunday.
The musician and the MMA fighter caused a scene when they began screaming at one another, seemingly out of nowhere.
Conor was spotted throwing a swing at MGK — surprisingly missing — before security could tear them apart.
A female can be heard screaming on camera, asking, "Where's Megan? Where is Megan? Where is Megan?!"
Moments later, Megan was seen running with a security guard as another woman shouted, "Go this way. Go this way. Get her out this way. Get her out this way."
As for what happened to cause the brawl? According to OK!, it started over McGregor allegedly DMing Megan. What he said, no one knows — at least, not yet.
Megan and MGK were first linked before anyone even knew she had split from her husband of 10 years, Brian Austin Green.
The two have been inseparable ever since — except tonight, at the Met Gala.