Yet despite the incredibly happy news, the genetically blessed couple appeared a little distracted as they took a stroll together through Sydney on Sunday.
Meanwhile, Harley wore a T-shirt and a pair of tight-fitting jeans Harley also gushed over gorgeous Natalie, who he called 'my precious darling sweetheart' and his 'endless inspiration'.
In the footage, Harley was seen surprising the blonde bombshell with an engagement ring, before getting down on bended knee.
Engaged: Harley and Natalie both pictured announced their engagement on Instagram on Monday, with the pair sharing a time-lapse clip Natalie wore a stunning floral dress for the momentous occasion.
At the time, Natalie shared a gushing tribute to her boyfriend and thanked the former Neighbours star for making her 'real life fairy tale' come true.
She went on to say she was thankful that he came into her life.