The Mortal Instruments: City of Bones stars reportedly parted ways in 2013 after one year of dating, and Collins has since been linked to Australian actor Thomas Cocquerel, but it seems she has now rekindled her romance with Bower.

In notes attached to a series of pictures of the former couple together posted on Instagram.com, she writes, "Some things strike a chord so strong... That they leave a constant melody playing in your head... And what it is, is something quite beautiful... Somewhere off the beaten track, the journey continues..."

Before dating Campbell Bower, Collins, who is rocker Phil Collins' daughter, was linked to Zac Efron in 2012 and Taylor Lautner from 2010 to 2011, while he was previously engaged to actress Bonnie Wright in 2011.