Omarion passed on the Legos and Tonka truck for his son's 2nd birthday ... opting for an art piece that set the singer back $18k.
The R&B star hired artist Madsteez to do a surreal painting of his 2-year-old son, Megaa ... a gift he presented at his kid's Kidchella-themed b-day party over the weekend in Granada Hills.
We're told Omarion reached out to Madsteez four days ago to make the 36" x 36" acrylic and spray paint piece -- which took 2 days to create.
As for the party ... the kids performed on a mini-stage and played in a bunch of bounce houses. There was also plenty of face painting.
Not too shabby.
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