The duo were seated courtside as they watched the Clippers beat the Kings 115-95. Witherspoon celebrated the victory on Thursday, Instagramming a cute mother-son selfie with Deacon sporting a Clippers hat.
"What a game!!," she captioned the sweet snap. "So much fun cheering on the #LAClippers last night ?? #ClippersNation."
When it comes to sharing sweet snaps on social media, the Oscar winner likes to show off her three kids — which include her 17-year-old daughter, Ava, and 4-year-old son Tennessee — along with another special member of the family.
The Wild star marked National Pet Day on Tuesday with an adorable pic of her French bulldog Pepper "enjoying cuddle time with her best friend Tennessee."
Witherspoon gushed over the pooch writing, "She lets us chase her, squish her funny face, and take her picture at least one million times a day. We love you #FrenchieLove#PepperPortraits."
The Big Little Lies star has also been using social media to encourage fans to push for a season two of the HBO series. Although a second installment has yet to be officially announced, author Liane Moriarty is already brainstorming ideas for a potential "new story."
"A lot of people have obediently done as Reese suggested," Moriarty said in a recent interview with the Sydney Morning Herald. "The producers have asked me to see if I can come up with some ideas. I wouldn't write a new book, but perhaps a new story and then we'll see what happens. I'm absolutely open to it...and there's definitely places you can go."