Do, do you have a first aid kit handy? Because Aubrey O'Day might give you a heart attack!

The Danity Kane singer showed off her slim physique on Instagram on Thursday, posing in a series of provocative shots that are sure to get the blood pumping.

In one, she puts some serious underboob on display -- while she goes topless in the other.

The caption: Love make up, hair, photo-shoots, & stealing your mans attention.

We think she may be successful with that last point!

It's unclear what the sexy photo shoot is actually for, but the 29-year-old is looking great these days -- and is clearly very comfortable with her post-weight loss bod.

Check out more stars who have gone through weight transformations in the gallery above.

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