Reese Witherspoon and ex-husband Ryan Phillippe, who have been divorced for 13 years, reunited for their sonDeacon's 18th birthday on Saturday night.To celebrate their youngest child becoming a legal adult, the former couple posed for pictures together before cutting into a $120 chocolate cake fromChristina Tosi's Milk Bar.'Happy 18th birthday to our gorgeous, smart, talented, and caring son.
You are a true light in this world and are so loved by all who know you,' the proud father captioned a slideshow of photos of himself,Deacon andWitherspoon seated side-by-side.
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