Britney Spears visited Tracey Ross in Sunset Plaza for a little Tuesday shopping ... and so does dozens of paparazzi, reporters, fans and even a Star Lines tour bus full of tourists ... all eager to 'get a piece' of Britney!!!

However, the scene turns hectic, and despite the pop star's bodyguard, Brit
Brit cannot make it back out to her car.

The bodyguard promptly summons the police who help hold back the throng so
Britney can make her getaway. As the How I Met Your Mother actress rolls off
the lot in her chauffeured Escalade, fans scream 'I love you, Britney!' and
'Britney for President!'