Los Angeles, Nov 23 (IANS): Singer Britney Spears's former husband Kevin Federline has received a backlash from social media users after he slammed singer Beyonce Knowles, saying she resorted to botox and plastic surgery for her good looks.

Federline took to Twitter to comment on the "Naughty Girl" hitmaker's looks when she was attending a boxing match here on Saturday. 

While many, including blog website Terez Owens, praised the 34-year-old superstar's good look, Federline begged to differ. 

"She looked botoxed," Federline tweeted in response to Owens's tweet, reports aceshowbiz.com.

He did not stop there. 

Federline added: "So sad when a beautiful woman chops and screws her face up with Botox and surgery." 

This invited naysayers for Federline.

Many people criticised his reputation of leaning on Spears's fame and fortune back in 2004. 

"@kevinfederline so sad when a boy takes a woman's hard earned money," a Twitter user wrote.

Another user took a dig at Federline's weight gain, writing: "@kevinfederline Sad when the only beauty in a man is in his body and he screws it and fills it with so much fat in it." 

Federline was married for three years to Spears and has two sons with her. He was her background dancer prior to their relationship.