Cher and Amanda Bynes got into a short Twitter feud on Wednesday when the iconic singer admitted she didn't know who Bynes was. 

It all started when the Twitter account @skyfieri asked Cher if she was upset Bynes called her "ugly and a flop." 

Cher responded: "Who's that?" 

Ouch! 

But Cher meant no harm by the comment. Later in the morning, Cher --apparently discovering who Bynes is -- sent a tweet apologizing. 

"@AmandaBynes  You got That One Right! SORRY About shade,Sweet- Heart,it was unintentional... Promise," Cher wrote on Twitter. 

Let's hope this is the beginning of a beautiful friendship. 

Bynes has stirred up plenty of drama on her own on Twitter. This week, she ranted about everyone from her father to Drake, eventually taking aim at Miley Cyrus.

Shortly after midnight last night, Bynes tweeted a brisk message to Liam Hemsworth's fiancée: "Ur ugly @mileycyrus." 

Cyrus has so far remained mum. 

This is yet the latest Twitter tirade unleashed by Bynes, who was arrested last month after allegedly throwing a bong out of her apartment window in Manhattan. 

MORE: Amanda Bynes Twitter Feud: Cher Ends Fight With Troubled 'Easy A' Star [VIDEO]