Credit: Jamie McCarthy/Getty Images

Jessica Simpson is off the market!

Sources confirm to that the singer, 30, became engaged to beau Eric Johnson on Thursday, just days after Us broke the news that her ex-husband, Nick Lachey, popped the question to Vanessa Minnillo, his love of nearly five years. Simpson and Lachey, 37, split in 2005, after three years of marriage.

The singer's rep confirmed the couple's engagement to Us on Sunday.

On Saturday, Simpson flashed a sizable ring on her left hand during an appearance at Dillard's at Oak Park Mall in Kansas City.

The Texas native began dating the former NFL player in May while he was estranged from his first wife, stylist Keri Johnson; their divorce was finalized five months later.

"I met a wonderful man," Simpson tweeted of Johnson in September. "Damn, I'm lucky."

The newly engaged couple will spend Thanksgiving in NYC, where Simpson is scheduled to perform during Macy's Thanksgiving Day parade.

"Having a boyfriend through the holidays, we're going to see how that all splits up," the singer told Ryan Seacrest during a KIIS-FM radio interview last week. "I can't imagine not being with my nephew and watching him open gifts. Maybe someone gets Christmas Eve and somebody gets Christmas day."