Their bond started on set, but it didn't stop there. Several costars from the biggest shows decided to make their friendship permanent by getting matching tattoos. From Pretty Little Liars and The Lord Of the Rings to Mamma Mia and Game of Thrones, a handful of cast members celebrated their time together by getting ink as meaningful as it is cool. Take Amanda Seyfried, who got matching tattoos with her Mamma Mia! costars Rachel McDowall and Ashley Lilley. After filming the music in 2008, they got "minge" inked onto their feet in 2014.