The pair's friendship has been praised by fans of the show and the girls have regularly been flying interstate to see each other.
On Thursday night the girls shared that they got matching tattoos, demonstrating the strength of their friendship.
After spending the week attending Australian Fashion Week shows, Dom and Ella got inked at Sydney Fine Line Tattoo Studio.
"We did a thing 💘 branded baby," Domenica wrote alongside two snaps of them at the tattoo shop.
"Yes we made it official. Tattoos last longer than rings Love comes and goes, friends last forever," Ella added on her post.
In the comments, Ella also explained that the tattoos are Cupid's angels, with the reality star responding to a follower who questioned what the tattoo meant, "We met on a love show for the Cupid 'catching love' and then you probably can’t see but it’s blowing an E and D. I have D for Dom and she’s got the E for me."
Ella's mum also commented, "This is just too cute. You are each other’s guardian angel," with Dom responding, "We really are."
Al Perkins also commented, writing, "I want one now," while Kate Laidlaw added, "Yass 🙌❤️."
Their followers loved the tattoos with one user writing, "Love that you guys did this. It's a shame that this day we still believe our male partner is our soul mate but everyday women cannot see that lady friendships, can be your one true soul mate relationship to get through life.
"Ladies united is a great understanding and appreciation beyond any male will ever know."
"I’m loving watching the friendship between the two of you grow," another wrote.
"The true love story of this season," a third added, with a fourth writing, "An unbreakable bond, love this."
"Soul sisters are so rare and if you find one in this lifetime you are blessed beyond measure," someone else said.
Never miss a thing. Sign up to Yahoo Lifestyle’s daily newsletter.
Or if you have a story idea, email us at email@example.com.