They come from New York, Los Angeles and several points in between. They range in age from 21 to 58. One is a Pilates instructor, one is a retired FBI agent, one is a waiter.

And, oh yeah, four of them will be meeting up with their exes pretty soon.

They are your "Big Brother 4" contestants -- nine of them, anyway. CBS is keeping the identities of the final four players -- former boyfriends and girlfriends of four of the others -- until the premiere Tuesday night (July 8). None of the 13 people, who are currently sequestered, know about the twist.

The nine people listed below will be the first to enter the house. Once they're inside, they'll learn that the four exes will be joining them, although they won't know whose former significant others they are until they arrive. Once everyone moves in, the game will proceed as usual, with a $500,000 prize at stake.

Here are the particulars for the first nine contestants:

Name: Alison Irwin
Age: 22
Occupation: Retail manager
Hometown: Meadville, Pa.

Name: Erika Landin
Age: 33
Occupation: Pilates instructor
Hometown: Los Angeles

Name: David Lane
Age: 21
Occupation: Former Army Ranger
Hometown: Deerfield Beach, Fla.

Name: Nathan Marlow
Age: 23
Occupation: Personal trainer
Hometown: Edmond, Okla.

Name: Jack Owens Jr.
Age: 58
Occupation: Retired FBI agent
Hometown: Birmingham, Ala.

Name: Brandon Showalter
Age: 28
Occupation: Computer engineer
Hometown: Newport Beach, Calif.

Name: Jun Song
Age: 27
Occupation: Investment manager
Hometown: New York

Name: Dana Varela
Age: 28
Occupation: Karate school manager
Hometown: Queens, N.Y.

Name: Scott Weintraub
Age: 33
Occupation: Waiter
Hometown: Chicago