The 26-year-old actress confirmed it's back on between her and British actor Jamie Campbell Bower on Wednesday, by sharing two super-sweet snapshots of the two of them flaunting their PDA on Instagram.
"Happy is what happy does. 50 shades of blush #cloud9ispinkright?...," Lily wrote alongside a pic of Jamie kissing her cheek.
Lily and Jamie met on the set of their 2013 film The Mortal Instruments: City of Bones, and started dating in 2012. They split in August 2013. Since their breakup, she was rumored to have dated Zac Efron, and most recently, the 33-year-old Avengers: Age of Ultron star.