That means Sinead, David and Lemar are competing in the big final next week.
Sinead and David won the public vote, but then the lucky pair chose Lemar to stay with them.
Sinead wowed the crowds with her version of old classic, One Way Or Another. She even stayed cool when the strap fell off her guitar at the start of the song.
Lemar sang a beautiful version of Nothing Compares 2 U - a hit for Sinead O'Connor in the 90s.