RHEL 6 and resize2fs

I performed the following:

[root@ex5b tmp]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_ex5b-lv_root
                      51606140  48632104    352596 100% /
tmpfs                 66073880         0  66073880   0% /dev/shm
/dev/sda1               495844     60297    409947  13% /boot
[root@ex5b tmp]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg_ex5b/lv_root
  VG Name                vg_ex5b
  LV UUID                yurcUj-lMPk-DPvL-Voo4-OEtS-Z92g-TPQURp
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/vg_ex5b/lv_home
  VG Name                vg_ex5b
  LV UUID                4X2SCc-pTkY-x3mU-sdYY-6LF6-Z9xm-MD6wP0
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

  --- Logical volume ---
  LV Name                /dev/vg_ex5b/lv_swap
  VG Name                vg_ex5b
  LV UUID                I1zVVz-njSc-v4GB-r3VO-X0br-GmPg-PrAWtX
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                128.16 GiB
  Current LE             32808
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

[root@ex5b tmp]# resize2fs  /dev/vg_ex5b/lv_home 40G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/vg_ex5b/lv_home to 10485760 (4k) blocks.
The filesystem on /dev/vg_ex5b/lv_home is now 10485760 blocks long.

[root@ex5b tmp]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg_ex5b/lv_root
  VG Name                vg_ex5b
  LV UUID                yurcUj-lMPk-DPvL-Voo4-OEtS-Z92g-TPQURp
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/vg_ex5b/lv_home
  VG Name                vg_ex5b
  LV UUID                4X2SCc-pTkY-x3mU-sdYY-6LF6-Z9xm-MD6wP0
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

  --- Logical volume ---
  LV Name                /dev/vg_ex5b/lv_swap
  VG Name                vg_ex5b
  LV UUID                I1zVVz-njSc-v4GB-r3VO-X0br-GmPg-PrAWtX
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                128.16 GiB
  Current LE             32808
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

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Shouldn't home have been resized to 40G, its LV is showing 50GiB