The actress revealed that she had Rob's full name inked onto her bum while the couple were in a serious relationship between 2007 and 2009. However, it is something that she now regrets and is paying the price for, by having it painfully removed.
Speaking on an episode of her new talk show, The Real, which she hosts alongside Tamera Mowry, Tamar Braxton, fashion guru Jeannie Mai and comedian Loni Love, Adrienne explained that her tattoo was even more of a blunder, since Rob's name is so long.
She said: "Laser tattoo removal, we are in the process. It's awful. Ten letter last name, Kardashian, it's pretty bad.
"Now that is a ratchet tattoo. I made a very bad decision. Don't follow my example."
And her reality TV ex also proved how strong his feelings were by getting Adrienne's name tattooed on his ribcage in 2008.
Adrienne added: "It actually says Robert. A. Kardashian. He has Adrienna Eliza Bailon on his rib... that's pretty bad too."
"[My tattoo] was sized down so much so that it actually started looking like a little black blob, so it's bad."
Rob and the former Disney channel star were together for two years before he admitted to cheating on her during their relationship, causing them to break up in 2009.
The pair appeared to be very much in love and Adrienne even made a number of appearances on Keeping Up With The Kardashians, as well as growing close to Rob's older sisters, Kim, Khloe and Kourtney.
So, perhaps it's no real surprise that the ex-lovebirds decided to proclaim their feelings for one another with a tattoo tribute.
In fact, Kim in particular was all for Rob getting Adrienne's name inked onto his skin.
Writing on her blog back in 2008, Kim said: "...my brother Rob is in lovvvve. I think it's totally adorable.
"I've been friends with Adrienne for a while and actually introduced her to Rob. I even brought her with me to my birthday party in October… never did I think they would get this serious!!! And by the way — Adrienne and I were fully supportive of his new tattoo!"
Despite things turning sour between the couple, Adrienne has remained friends with Rob's sisters and met up with Kourtney to offer her some acting advice on an episode of Kourtney and Kim Take New York in 2011.
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