The blonde bombshell, 35, is always posting pictures of the couple's glamorous life together, whether it is romantic holidays, extravagant shopping trips or scantily-clad bikini snaps.
Katja, 35, is never shy in flashing the flesh on Instagram to the delight of her 36,000 followers.
Marcel popped the question during a romantic Christmas and New Year holiday to the Maldives just over a year ago, and the couple already share 21-month-old daughter Mary-Lou.
The loved-up pair also have two dogs to complete their idyllic life, called Coco and Jessy.
But it has not been all plain sailing for Katja.
She was a contestant on the German version of dating show The Bachelor before meeting Sabitzer.
Katja ended up winning but her relationship with banker Christian Tews only lasted a few months.
And the blonde beauty almost lost her eyesight due to a problem with her corneas.
The mum had to have three operations to save her sight, while her doctor said at one point she "could not see much further than 5cm".
Katya said: "I was almost blind. Few people knew that, I was always afraid of the reactions."
It is believed Sabitzer, who has impressed for German club Leipzig, could be available for as little as £30million in the summer. It has alerted a host of top clubs to the potential transfer.
But a move could be delayed until the summer, reports DailyExpress.
It remains to be seen whether London will be his preferred destination.