The singer was married for 55 hours in January

Reports say Federline has been dating Spears for about two months and moved in with her after she had surgery two weeks ago to repair a knee injury.

The injury forced the singer to call off her Onyx Hotel tour and will keep her from performing for several months.

News of the engagement comes months after she annulled her whirlwind Las Vegas wedding to a childhood friend.

The marriage lasted just 55 hours before the sheepish pair obtained an annulment, with Spears, 22, saying the nuptials had been a "cool" idea that quickly became a huge mistake.

Her personal publicist and her record label, Jive Records, have both confirmed the latest news.

"I can confirm that yes, she is engaged," Jive's Sonia Muckle said.

The AFP news agency also reported that her personal publicist, Nicole King, had also confirmed the news.

But there was no statement from Spears, and no date for marriage had yet been set.

Federline, 26, has a two-year-old daughter from his previous relationship with actress Shar Jackson, who is expecting another baby by him in July.

He has also appeared on tour with Justin Timberlake, Spears' former boyfriend.