Lady Gaga has taken the plunge!

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The pop star left her hotel in West Hollywood yesterday in a dress with one seriously plunging neckline.

Gaga showed off her assets outside of the Chateau Marmont, where tons of fans were waiting to get a glimpse of her before she went to Jimmy Kimmel.

We're told Gaga sent McDonald's to the fans while they waited.

At Kimmel, Gaga gave back to her fans too. After performing three songs for the late night show and their online site, LG performed 2 additional songs for the crowd -- playing "Edge of Glory," "You and I," "Born This Way," "Hair" and "Judas."

See more photos above, and watch her killer "You and I" performance below.

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