Kelly Osbourne has apologised for her angry response to Lady Gaga's birthday cake peace offering. The two women have been tangled in a public feud since Osbourne was bullied online by some of Lady Gaga's fans, prompting the Bad Romance singer to pen a message to her former pal in January (13) criticising her part in U.S. show Fashion Police. Sharon Osbourne fuelled the war of words when she jumped to her daughter's defence and branded Gaga an attention seeker, but the two appeared to have settled their differences when The X Factor judge gave the pop star a standing ovation following her performance on the U.K. version of the TV talent show on Sunday (27Oct13), The singer then presented the rock manager with a cake for her daughter, who celebrated her birthday on Sunday (27Oct13), but Kelly spurned the peace offering with an angry tweet, writing, "Not to be ungrateful but why would you send me a birthday cake via my MOTHER in a country half the would away? #JustSendItToME #LoveNotWar EatMyS**t #Hypocrisy." But Osbourne has now backtracked and apologised for her response, admitting it was childish and insisting she is eager to end the feud with Gaga. She took to Twitter.com on Monday evening (28Oct13) to write, "@ladygaga I acted like a child last night. Just not into publicity stunts call me & we will end this like adults I dont want 2 (to) fight anymore."