Several snaps show Rob greeting Lindsay, who was also one of the celebrity judges on The Masked Singer Australia, which Rob also appeared on as a contestant.
Lindsay, who cut a stylish figure in a pale pink frock, was all smiles as the 37-year-old took her hand and leaned in for a smooch.
Opting for understated glamour, Lindsay’s billowy dress featured a fitted bodice with spaghetti straps and intricate beading and feather detailing.
Lindsay showed off her incredibly youthful visage with a raceday makeup look, consisting of rich copper tones, layers of mascara and a blush pink lip.
She wore her auburn tresses in a classic chignon-style hairdo with several loose stands flowing either side of her face, which revealed her well-defined brows.
The Parent Trap star elevated her red carpet look with a delicate star-emblazoned headband and added a pair of oversized glasses to complete her ensemble.
Rob’s smooch with Lindsay comes after Paris recently dished some serious shade towards him when she appeared on The Project.
When co-host Ryan “Fitzy” Fitzgerald asked: “This is an old flame, but do you still keep in contact with Millsy? Robert Mills? Remember Millsy?”
Paris replied: “Who?” before shaking her head and saying “No”.