Fearne was chatting to fellow Radio 1 star Nick Grimshaw about the glitzy event this morning when she accused Lily of ignoring her.
Fearne said: "Lily Allen blanked me last night. Five times. She blanked me five times in a row."
Nick began to rib Fearne but she continued: "I don't hate her. I got on with her really well last time she was here. We were in a great place. We talked about the kids.
"So I thought, 'Oh, I'll say hi at the Brits'. She looked through me like a pane of glass.
"And she blanked Jesse. You know my boyfriend is the nicest guy in the world... blanked."
@Fearnecotton I did not blank you. That is simply not true. I didn't see you or your husband.— Lily Allen (@lilyallen) February 20, 2014
After hearing her comments on the radio, Lily has now hit back at Fearne on Twitter.
The mum-of-two said: "I did not blank you. That is simply not true. I didn't see you or your husband [sic]." Lily added: "Why couldn't you just come over a say hi yourself?"
One fan tweeted back: "You couldn't have just text/called Fearne? Chose to publicise it on Twitter so it makes the papers, poor that Lily."
Lily shot back: "She was just talking about it on the radio that's why."
We're interested to see how this one plays out. Watch this space!
The Brits 2014 red carpet in pictures:
Copyright: WENN Lia Toby