Britney Spears has arrived at L.A. Superior Court for a progress-report hearing on her ongoing custody battle with ex Kevin Federline.

She pulled up in her white Mercedes convertible (with the top up). Spears — who was accompanied by her longtime pal Alli Sims — was swarmed by paparazzi. “They are on my car!” Spears (in huge sunglasses, a dark short dress and cowboy boots with her hair down) was overheard complaining to Sims.

After spending minutes struggling to park, she finally entered the courthouse a short time later.

Here is what is expected go down at today’s hearing:

Spears’ lawyer, Sorrell Trope, is likely to argue that the singer has complied with all court orders and should regain the 50-50 custody of sons Sean Preston, 2, and Jayden James, 1, which she lost on October 1. (Court orders include undergoing twice-weekly random drug testing, as well as attending co-parenting sessions with ex Federline.)

At a hearing Friday morning, attorneys for both argued about the issue of Spears’ deposition — which will occur at a later hearing.

Federline’s attorney, Mark Vincent Kaplan, claimed that he has asked Spears’ attorneys several times to schedule the singer’s deposition. (Based on Spears’ testimony, Kaplan is likely to argue that Federline deserves primary physical custody of the boys.)

L.A. Superior Court Commissioner Scott Gordon ordered both sides to meet and set a date, but said Spears’ testimony would not be videotaped.

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