Britney Spears and Demi Lovato Surprise ‘X Factor’ Judge L.A. Reid With Birthday Cake (EXCLUSIVE PHOTOS)

at 7:11 pm | By

Brit's 'X Factor'!
Britney Spears will be a judge on the reality competition!
Talk about living the sweet life!

Following another round of successful auditions in Kansas City, Mo., Britney Spears and Demi Lovato surprised fellow judge L.A. Reid to a birthday cake for his big 5-6. Although Reid tried to keep his birthday under wraps, Spears, 30, and Lovato, 19, foiled his plans and brought out a chocolate cake.

Spears even serenaded the record exec for his big day.

Where was X Factor creator Simon Cowell when all of this as going down?

As Celebuzz reported, the 52-year-old music mogul was recently being struck down with a bout bronchitis and had to pull out of filming Friday and Saturday’s portions of The X Factor auditions. He’s currently resting in his multi-million dollar home in Los Angeles.

However, Cowell’s stand-in — Irish music manager Louis Walsh — was on hand to help ring in Reid’s birthday, which fell on June 7.

In fact, Spears and Lovato have gotten along with Walsh swimmingly this week.

“I love Louis, he’s really fun and I think he’s absolutely adorable. I do miss Simon a little bit though,” Spears told Celebuzz after Kansas City’s the first day of auditions had wrapped.

Lovato added: “There is only one Simon… but Louis killed it tonight (Friday).”

According to reports, Cowell persuaded the executives at Fox that Walsh was the right man for the job and convinced them to fly his pal out on a private jet — a cost of almost $200,000.

“I absolutely love working with Louis,” birthday boy Reid told us. “I find him fascinatingly quick, thorough and remarkably entertaining.”

For more from this week’s The X Factor auditions, check out the gallery above!