Westerman, a 6-foot-5, 290-pound lineman who is the top player in Arizona, originally committed to Texas last spring but re-opened his recruitment after the Longhorns' coaching staff overhaul. He visited Auburn in December.
Scout lists him as a five-star recruit, the No. 1 offensive guard and No. 17 player overall. Rivals ranks him as a four-star recruit, the nation's No. 3 offensive tackle and No. 27 overall recruit.
Westerman is Auburn's 19th commitment for 2011. He is the fourth offensive lineman in the class, joining Reese Dismukes (Spanish Fort, Ala.) and Thomas O'Reilly (Marietta, Ga.), who are both already enrolled in school, and Greg Robinson (Thibodaux, La.).
Auburn, which loses four senior starters on its line, has had 11 offensive linemen in its last two recruiting classes.
National Signing Day is Feb. 2.
Here's an updated list of Auburn's commitments (star ratings are by Rivals):
- Angelo Blackson, DL, 6-5, 289, 3-star, Bear, Del. (Red Lion Christian Academy)
- Quan Bray, ATH, 5-11, 178, 4-star, LaGrange, Ga. (Troup County High)
- Brent Calloway, RB/LB, 6-1, 210, 5-star, Russellville, Ala. (Russellville High)
- Sammie Coates, WR, 6-3, 170, 3-star, Leroy, Ala. (Leroy High)
- Jaylon Denson, WR, 6-3, 190, 4-star, Hoover, Ala. (Hoover High)
- Reese Dismukes, C, 6-3, 272, 4-star, Spanish Fort, Ala. (Spanish Fort High)
- Kiehl Frazier, QB, 6-3, 215, 4-star, Springdale, Ark. (Shiloh Christian)
- Kris Frost, ATH, 6-3, 210, 5-star, Matthews, N.C. (Butler High)
- Justin Garrett, OLB, 6-2, 185, 3-star, Tucker, Ga. (Tucker High)
- Keymiya Harrell, DE, 6-5, 235, 3-star, Plantersville, Ala. (Dallas County High)
- Chris Landrum, LB, 6-2, 215, 3-star, Sweet Water, Ala. (Sweet Water High)
- JaBrian Niles, DE, 6-2, 270, 3-star, Mobile, Ala. (Davidson High)
- Thomas O'Reilly, OL, 6-3, 315, 3-star, Marietta, Ga. (Pope High)
- Greg Robinson, OL, 6-5, 296, 4-star, Thibodaux, La. (Thibodaux High)
- Jonathan Rose, CB, 6-2, 170, 4-star, Leeds, Ala. (Leeds High)
- Anthony Swain, S, 6-3, 215, 3-star, Gadsden, Ala. (Gadsden City High)
- Robenson Therezie, DB, 5-10, 180, 4-star, Miami, Fla. (Jackson High)
- C.J. Uzomah, TE/HB, 6-5, 230, 3-star, Suwanee, Ga. (North Gwinnett High)
- Christian Westerman, OL, 6-5, 290, 4-star, Chandler, Ariz. (Hamilton High)