If you mean "right this instant", she's not here just now, so I don't know.
Wireless microphones do not make you "sing better." Microphones convert sound into electrical signals which can then be processed and/or amplified, but they aren't magic sing-better devices, not even the wireless ones.
It is unusual, to say the least, for a pop artist performing in even a small venue to NOT use a microphone of some kind, and wireless ones are generally more convenient than wired ones.
Lady Gaga
Lady Gaga.
lady gaga
She has a Verizon Wireless.
lady gaga
Lady Gaga.
LADY GAGA, any day!
Lady gaga
Lady Gaga is shorter than Beyonce but Lady Gaga's voice is much better.
No, Lady Gaga is a LOT better than Marianas Trench
Lady Gaga. In many, many ways.
Lady Gaga tops. :PLady Gaga is more famousLady Gaga is more famous