Britney arrived to the UCLA Medical Center in Los Angeles around noon on Monday.
"X17online photographers spotted Britney being driven by her bodyguard as she sat in the passenger seat, followed by another two cars."
Britney's kids Sean and Jayden were not seen in the car, but it's possible they are the reason for the hospital visit.
UPDATE: Photogs claim Britney walked into the children's wing of the hospital.
UPDATE: According to x17online.com, "Britney arrived at UCLA Medical Center's Mattel Children's Hospital with two cars following her and a police escort which was pre-planned. The caravan of cars wasn't didn't appear to be moving in a way that would suggest there was an emergency. The whole thing started around noon PT today when the three cars left Spears' Calabasas home, heading for Westwood."
Hospital reps cannot confirm nor deny the story, saying "we can't comment due to patient confidentiality."
Unconfirmed reports say one of Britney’s children was being treated in the emergency room, says Radaronline.com.
UPDATE: According to PerezHilton via Twitter, everything is ok:
"Just spoke to the Spears camp. Everything is okay and Britney has just gone in for a "routine doctor visit". Thankfully! :-)"
UPDATE:"Everything is fine," Britney's rep tells X17online. "Britney is there for an annual physical."
Glad everything is ok!
UPDATE: UCLA PD denies Britney arrived with a full police escort.