|Wu Si Xuan|
|Also Known As||Shenshen (Japanese: シェンシェン; Mandarin: 喜樂), Xi Le (喜樂), Shan, 唐可玄|
|Born||January 10, 1988|
|Years Active||2008-2010, 2013–present|
|Associated Acts||Ice Creamusume|
As of 2013, she is active in Taiwan under the stage name Shan.
Before participating in the Taiwanese Hello! Project audition, Wu had already participated in several other auditions and also modelled. She was one of the four finalists chosen from the audition. As the eldest of the group, she is also its leader.
- Stage Name: Shan
- Real Name: Wu Si Xuan (吳思璇)
- Japanese Stage Name: Shenshen (シェンシェン)
- Taiwanese Nickname: Xi Le (喜樂)
- Date of Birth: January 10, 1988
- Astrological Sign: Capricorn
- Blood type: O
- Flavor (Member Color): Blueberry
- Hobby: Watching movies, writing songs, dancing, and not using her brain from time to time
- Favourite food: Seafood, doria, daifuku
- Dislikes: Ants, flu and stomach aches
- Hello! Project Groups:
- Ice Creamusume (2008-2010)
-  PMAM慾望俱樂部
-  Ni Zhao Liang Wo Xin Qiu (你照亮我星球; You Light Up My Star)
- She has an older brother.
- She participated in a singing competition called "One Million Star", similar to American Idol, prior to the New Star auditions.
- Shenshen, along with Reirei, was an MC for Abe Natsumi's Fan Club event in Taiwan in 2009.
- She can't whistle.
- She has competed in contests with her belly dancing.
- She did some amateur modeling before NEW STAR and Ice Creamusume.
Leader of Ice Creamusume