It's the feud no one saw coming - and it's also the feud we can't stop talking about.
In one corner: Miley Cyrus, 20-year artist, wrecking ball rider, nearly naked Twerker extraordinaire.
Who comes out when we measure these stars against each other in a patented THG Tale of the Tape? Ring the ball and let's find out!
O'Connor: REALLY short
MEMORABLE SNL EXPERIENCE
Cyrus: Portraying Justin Bieber
O'Connor: Tearing photo of The Pope in half
O'Connor: The music industry
O'Connor: "Nothing Compares 2 U"
Cyrus: "Wrecking Ball"
O'Connor: Sinéad Marie Bernadette O'Connor
Cyrus: Destiny Hope Cyrus
MOST DARING FASHION STATEMENT
O'Connor: Giant chest tattoo
Cyrus: This thing
O'Connor: Frank Sinatra in 1991: "I'd like to kiss her in the ass!"
Cyrus: Dr. Laura in 2013: "Miley Cyrus is a piece of scum."
MOST FAMOUSLY SHAVES
VERDICT: It's a tight one! But Miley pulls out this contest by a final score of 4-3-3. Who would have guessed that Dr. Laura would put her over the edge?
Do you agree with these results? Chime in now and choose a side:
Who are you with in the Sinead O'Connor vs. Miley Cyrus feud?