CONOR MCGREGOR posted on Instagram to wish Rian a happy birthday.
33-year-old UFC star shared photos of the party celebrations.
Conor McGregor celebrates Rian's first Birthday
He held Rian in one arm and took a picture of the birthday balloons in front of him. He was wearing a brightly-coloured shirt without buttons.
He shared photos of Rian, France's St Tropez, France, a few days back, and called his son "the boss".
Rian and the Irishman were enjoying the sun while Rian took another photo of the Irishman showing off his tattoos.
McGregor shared his snaps on Instagram with the following message: "Happy 1st Birthday Rian McGregor. Daddy loves you so very 
"
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Rian's aunt Aoife said: "Happy 1st Birthday Rian
" I love you."
McGregor's fans have also shared their wishes for a happy birthday, with the post gaining 330,000 likes in just four hours.
McGregor spent time this month with his family while he was testing his Lamborghini superyacht.
The fighter spent PS2.4million on the boat, and another PS400,000 to add his Proper Twelve branding.
SIGN UP DEALS AND FREE BETS - THE BEST NEW CUSTOMER OFFERINGSHe shared many photos of himself with his children and Dee Devlin (his fiancee), which he was seen cuddling up to.
McGregor was also seen on video hitting the pads as he continues to recover from his leg injury last year.
The Notorious took time to measure each shot and thundered off of the pad.
Mystic Mac tweeted later: "I will sink those bow and arrows in the target. In live fighting.
"For the whole world to see. Again. These arrows, however, are very different from the ones before. Corkscrewed. Knuckles."
