Model Kris Smith attends a party at former X Factor judge Dannii Minogue's home
The male model, 33, was spotted dropping off the toddler, who turned 2 on Thursday, at the former X Factor judge’s Melbourne home on Saturday afternoon.
He left shortly afterwards but returned later with a host of guests to enjoy the festivities.
‘A very happy balloon filled day for Ethan #BirthdayNumberTwo,’ Tweeted Dannii, 40, on her son’s big day.
She and Kris announced that they’d ended their 4-year relationship in April.
Kris moved out of the luxury house he and Dannii shared soon after.
Both made it clear at the time that they were keen to stay on good terms for the sake of their Ethan.
‘Dannii and I have a deep mutual love and respect for each other,’ Tweeted Kris.
‘Although things have not worked out we have a gorgeous son together that we both love and implore everyone to respect our privacy at this challenging time.’
SEE PICTURES Dannii Minogue and Kris Smith‘s relationship in pictures>>