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How to get free space in LVM disk running Fedora 18

I'm trying run a virtual host on my mashine using xen. For this purpose I need to create a new logical volume to be used as the virtual disk for the DomU. But vgdisplay says that I don't have any Free PE. Actually, I have about 200GB of unallocated disk space, but I don't know how to use that?

--- Volume group ---
VG Name               fedora_seafourium
System ID             
Format                lvm2
Metadata Areas        1
Metadata Sequence No  4
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                3
Open LV               3
Max PV                0
Cur PV                1
Act PV                1
VG Size               64,00 GiB
PE Size               4,00 MiB
Total PE              16385
Alloc PE / Size       16385 / 64,00 GiB
Free  PE / Size       0 / 0   
VG UUID               rwKWGT-Mx3q-7HaP-He20-3IDk-Gdrp-JAvK4F

I don't really use those 64 GB, why it says hat there is no Free PE? I'm very new to Fedora, and don't really understand how should I partition the disk... please help.

 PV        VG               Fmt Attr PSize PFree 
/dev/sda2 fedora_seafourium lvm2 a-- 64,00g 0

# cat /proc/partitions 
major minor #blocks name
    8 0 312571224 sda 
    8 1 512000 sda1  
    8 2 67117056 sda2 
    11 0 1048575 sr0 
   253 0 3981312 dm-0 
   253 1 12288000 dm-1 
   253 2 50843648 dm-2