Reese Witherspoon had reason to celebrate on Saturday as her oldest son turned 18.MORE: Reese Witherspoon gets the best reaction from Drew Barrymore on her youngest son's birthdayThe Legally Blonde star made sure Deacon had a day to remember, and the teenager was joined by both his parents for the occasion.Proud dad Ryan Phillippe took to Instagram to share a lovely picture of himself, Deacon and ex-wife Reese smiling at the table in a restaurant in front of a birthday cake, alongside a heartfelt message.VIDEO: Reese Witherspoon's children make rare appearance in fun video from their LA homeThe actor wrote: "Happy 18th birthday to our gorgeous, smart, talented, and caring son.
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