Boomer showed off his Olympic spirit ahead of the opening ceremony.
Photo: Instagram/@nicole.m.johnson
2/5
Boomer wore a "golden" shirt to celebrate Michael's pre-Olympic accomplishments.
Photo: Instagram/@nicole.m.johnson
3/5
Boomer showed his pride in a adorable stars and stripes outfit before his father's big victory.
Photo: Instagram/@boomerrphelps
4/5
Nicole showed off this picture of Boomer talking to his father after he brought home the gold for Team USA during the 4x100m freestyle.
Photo: Instagram/@nicole.m.johnson
5/5
Boomer was a gold medal athlete in his matching shirt and shoes.
Photo: Instagram/@boomerrphelps