The ongoing feud between LeAnn Rimes and Brandi Glanville flared again this week when the reality star reportedly dissed the country singer over a Mother's Day gift.

On Sunday, Rimes sent flowers to Glanville for Mother's Day as a peace offering of sorts, Us Weekly notes. (Rimes is the stepmother of Glanville's children with Eddie Cibrian.) However, it appears the "Real Housewives of Beverly Hills" star did not take kindly to the gesture and failed to thank Rimes.

The reality star later took to Twitter, saying:

Rimes responded, tweeting, "[T]his was actually the first acknowledgement of my gesture I was made aware of. I didn't see anything else sent to me. It wasn't for the 'thank you.' It was to just simply say Happy Mother's Day."

She also retweeted a seemingly cryptic message reading: "Stop giving the people who have nothing positive to say about you an ear. Ignore them and keep doing your thing."

The feud between Rimes and Glanville has been playing out in the public arena since the singer and Cibrian had an affair in 2009 and married two years later. One point of contention has been Rimes' relationship with Glanville's sons -- Jake, 5, and Mason, 9.

“I don’t think we’ll be friends, but I hope we can coexist peacefully,” the former model told "Access Hollywood" in February. “I think once she has a child of her own, I think she will understand boundaries and what’s respectful to do and how to handle things a little better.”

The Bravo star told Andy Cohen in March that she is done "speaking poorly" about Rimes, but she isn't the only one to engage publicly. The 30-year-old "Spitfire" songstress has been vocal about her feelings in the press as well.