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She may have been trying to keep their relationship under wraps because of her contractual ties to Channel Seven, which airs Holey Moley.
The Bachelorette is broadcast on rival network Channel 10.
Playing coy: Montana had previously denied the pair were dating after the So Dramatic! podcast first reported on their romance
Frazer's love life has been the source of much speculation since his split from last year's Bachelorette Elly Miles a few months ago.
The Queensland concreter called it quits with Elly in early December, just months after she'd chosen him as her winner on the dating show.
Confirming the sad news, Elly announced in an Instagram video on December 4 that the couple had grown 'apart' since filming the series.