Reese Witherspoon has co-authored her first adult novel, “Gone Before Goodbye,” with Harlan Coben.

Reese Witherspoon has played a number of wonderful characters over the years (Tracy Flick, Elle Woods, Madeline Martha Mackenzie), but her all-time favorite role? The 43-year-old actress took to her Reese Witherspoon x Hello Sunshine YouTube page on Thursday, posting a delightful video about motherhood and what she's learned over the years. Witherspoon continues on, saying that it's really important to find a "support system" of "#momfriends." "I think beyond money, beyond being ready in your career and your life, it's really about, is your support system good? She added, "I think the older you get, you realize you don't know anything about anything, you know?"