Rumer Willis took to social media to open up about her sobriety. "Yesterday I celebrated 6 Months of Sobriety...I can honestly say I have never been more proud of myself in my entire life." The 28-year-old thanked her fans and followers for their support throughout her journey. Rumer's younger sister, Tallulah, went to rehab back in 2014 for substance abuse and an eating disorder.