Lady Gaga made her fair share of enemies last week when she performed in a wheelchair during a concert in Sydney, Australia.

Now she appears to have ticked off Bette Midler as well. Over the weekend, the Divine Miss M sent a number of hostile tweets at Gaga, accusing the ‘Born This Way’ singer of stealing her act.

“I’m not sure @ladygaga knows that I’ve performed my mermaid in a wheelchair for millions of people — and many of them are still alive,” she tweeted Friday, referring to an outfit she donned as part of a Las Vegas show.

Midler followed with a series of tweets on Saturday, saying, “Dear @ladygaga if you think a mermaid in a wheelchair seems familiar-it’s because it is! You can see it on youtube 24/7-with ME performing it … Ive been doing singing mermaid in a wheelchair since 1980-You can keep the meat dress and the firecracker.”

So was Midler serious? Maybe not: “Let’s drink this over at the Emmys in September. Fabulous mermaids can coexist!” she tweeted Sunday. Both ladies are nominated for their televised concert specials.

Check out the divas’ performances below and decide who does the best choreography on wheels: