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Beyoncé got hearts racing at the F1 event in Las Vegas ... bringing more excitement to an already electrifying event when she bared her cleavage.

The singer-songwriter led the celebrity attendees at Saturday night's race ... walking into the event on the arm of her man, Jay-Z -- though we doubt anyone looked much at him. Getty

After all, his wife wore an alluring white and black leather top -- much in the fashion of a racecar driver's uniform ... though she pulled the zipper of hers down to the middle of her chest, leaving little to the imagination.

Her curly locks flower to the middle of her shoulders ... and, she flashed a huge grin on her face while taking in the wild atmosphere of the annual event.

Queen Bey and Jay have taken some time off of their busy schedules t

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