Co-stars including Nicholas Cartwright and Home and Away hair and make-up artist Laura Vazquez were among those to celebrate her new gig.
When the news was first revealed, Kirsty said she was "ecstatic" to share her latest role with fans.
"Can finally come clean about this hot piece of news I’ve been harbouring for the last 2 months," she wrote on Instagram. "Ecstatic to announce I’ve been welcomed as a series reg on Home and Away. Woah.
"Getting to be a part of this Aus icon-of-a-show is a bit wild. It’s been a gorg 6 weeks of shooting as I embrace the bay as new resident brown girl, Rose."
Her character Rose has also been revealed to be a secret sibling of Summer Bay favourite Jasmine after she shows up unexpectedly with her brother Xander, played by Luke Van Os.
After arriving in the Bay, Rose looks to begin work as a police officer and soon develops the hots for a prospective colleague, the only problem is he’s dating her new half-sister.
Their sudden arrival also raises the question as to what brings them to Summer Bay in the first place, and whether Jasmine will accept Rose and Xander into her life.
Home and Away airs Monday to Thursday at 7.00pm on Channel 7 and 7plus.