Ashley MCMullen took to Instagram earlier this week (beg27Apr15) and took aim at the Skyscraper star for covering up the kiss tattoo with a rose without ever crediting her.

The ink artist raged, "Thanks for getting the tattoo covered up I did for free that you specifically asked for. Not to mention you didn't even have the courtesy to offer me any money in the first place. You p**sed all over our toilet seat and you made a fool of yourself. What a shame that people look up to you. The tattoo you covered it with kinda sucks too. Looks like you might forever be a goon."

After appearing to take the high road by simply responding to MCMullen with a series of emojis, Lovato took to social media on Thursday (30Apr15) to respond to the tattooist.

She tweeted, "First, I would like to say I'm really sorry I don't remember you or getting tattooed by you, but as you know I was f**ked up and sometimes people act like '#turds' when they're loaded. Second, I apologize for my '#peepeetoiletseat'... That wasn't on purpose, I was simply a drunken teenage girl. Lastly, I apologize for making fun of your work... But... if I were you, I wouldn't claim that one (tattoo) because it looked more like an open vagina (or even a butt hole as my 8 year old little sister called it at the time).

"I also wouldn't be admitting to the fact that you tattooed a very intoxicated 18 year old on a tour bus without the proper judgement that most legit tattoo artists have of saying, 'Hmm... This underage kid is wasted, maybe I shouldn't permanently ink a hot pink kiss mark on this girl's wrist...? Oh well... F**k it, she's famous'."

She added, "Maybe next time you should wait for the person to get your tattoo sober so they would actually remember getting the tattoo in the first place, or perhaps you could've thought about all of this as a blessing that I forgot everything about you - that was until you outted (sic) yourself for the now internationally infamous 'vagina tattoo'."