An accompanying message in German read: “I know I have messed you about Mandy, but I will always love you.”
But the Ozil soon claimed he had been hacked.
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He posted: “As you may have seen my account was hacked this evening. Thanks to my team and Instagram for assisting me today in getting control back of my Instagram.”
The original post was removed half-an-hour later.
Ozil had been in an on-off relationship with the pop star since, but Capristo gave Ozil the red card in 2014 following reports he had cheated on her.
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The pair were later seen together at the 2015 Bambi Awards in Berlin fuelling speculation the two were back together.
But Ozil is now in a relationship with former Miss Turkey, Amine Gulse, and it is believed they could be engaged after Turkish media snapped the gorgeous brunette wearing an engagement ring.
They have since been snapped together in London.