Is this too much?

It probably flatter her since you're complimenting her but she may take it as being too cheesy. Because if somebody told me, "Hey, beautiful!", I wouldn't be thinking, "wow, he really likes me!". And trust me, if it wasn't from a right person, it can put a negative affect. Just start out by having a normal regular conversation. Listen to what she's got to say. Learn what she likes. Find out if she's a match for you. If you know she likes you, then just ask her out!

A woman would rather hear something a little more flattering than "hey baby! Lookin' good!" It sends the wrong message that you are a player. Give her a genuine compliment on something that she controls like her hair, style, makeup, etc. For example: "Hey, that skirt is really pretty. You look beautiful." or "Your hair looks stunning today, did you do something new?" She put in the time and effort into those things, therefore she will appreciate it more. If she likes you too, she will be waiting for you to compliment her like this.

Yes....one it's over the top cheesy and two it's the work place. Why not smile, say hi and compliment her on an outfit or say you look especially pretty today. But do NOT make any comments about sex or saying sexy, that could get you in trouble with HR if someone were to overhear you. Or better yet if you are so sure ask her to lunch or for a coffee/drink after work.

Definitely don't use hey sexy. Hey beautiful is fine, but leave it for a little later maybe. Start with just noticing little things about her, for example, if you think she has a nice smile, tell her that she's got a nice smile, and keep it compliments non-sexual. Once she's more comfortable with you and such, you can use hey beautiful.

I agree with the guys who have replied. The only thing I disagree with is the compliment. It's okay to tell her (after some reciprocated flirting) you find her attractive/pretty/beautiful. Those are acceptable terms and what girl DOESN'T like to hear she's beautiful? However, don't call her sexy. That would make many girls uncomfortable unless it was our boyfriend saying it to us or a guy we had a thing with for awhile. It's really inappropriate.

If she is beautiful, guess she hears that compliment once to often.

try being different, a little more creative in ur approach. Even though she like you, she would get attracted towards you more if you say something to tell her that's just not common...

Schneider has a point. You have to ramp these things up. You start with the looks, then the smiles, then some casual compliments. You need to be watching for reciprocation the entire time you're doing this, and these things can take days to go through, depending on how frequently you work together.

Anyways, keep an eye out for her returning the looks, smiles, compliments. If she doesn't do that, she's not interested. Just enjoy having the eye candy around work and move on.

If she does return the signals, you ramp it up again. You move from a casual compliment (you look nice today, I like that shirt on you, etc...) to more direct compliments. Direct compliments can be awkward at first. it can be difficult to choose the right way to deliver them. The right time, etc... These might be classically considered, "pickup lines". But please, do not delivery any classic pickup lines. Be creative. Take something original about her, something you genuinely find attractive and just stop and tell her. Make sure you don't say it "in passing". That makes the compliment feel less than what it is. It's not a passing, casual compliment. You took some time to come up with it. Make sure she's paying attention when you deliver it.

Pay attention to how she reacts. Some girls will just want to be flirty at work, that's just how they are. If she seems weird about the direct compliment, just let it go. Eye candy, remember?

If she does pick up on it, and returns the response with some kind of positive signal, you're on your way.

Save the sexy/beautiful for an established girlfriend. It sounds possessive and females do not want to feel like you think you can endow them with these kinds of titles. That's what they are titles. If you think she's sexy, then tell her. "I think you're super sexy. Damn." etc... Calling her... saying, "Hey" and using the word Sexy instead of her name... ya, that's not the same thing.

Just slow down and ramp it up as it becomes appropriate. Pay attention to how she reacts to your advances. She will let you know when you've gone too far, through those female signals. Learn those and you'll be in great shape. Good luck.

Whoa whoa
back up, back up
is this 'hey sexy' statement coming out of the blue?
have you ever complimented her looks before? (clothes, hair, appearance?)

it might offend her if you haven't.

has she ever complimented your looks?

you should probably still start out slow.

flirting involves more than just words. it is body language also.