Tipping for a pedicure / manicure?

At a salon, do you tip the girl who did the work, or do you tip when you pay at the front desk?Tipping for a pedicure / manicure?
Always hand the tip directly to the person who provides your service. S/he can then decide how/if they want to divvy it up.Tipping for a pedicure / manicure?
You would tip the girl who did your work.
I hardly carry cash, so I have to add the tip to the bill.
The girl who did the work. You can just go up to her/him and hand them the tip/cash. Sometimes (depending on where you go) they will ask you what you would like to tip and add it to the charge.
Tip the girl who did your nails.
Yes, tip whoever did the work. That way, you know that it's going to the correct person.