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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on April 21, 2011. Meeting Information CELANESE CORPORATION Meeting Type: Annual Meeting For holders as of: February 23, 2011 Date: April 21, 2011 Time: 7:30 a.m., CDT Location: The Crescent Club 200 Crescent Court,17th Floor Dallas, TX 75201 You are receiving this communication because you hold shares in the above named company. CELANESE CORPORATION 1601 W. LBJ FREEWAY This is not a ballot. You cannot use this notice to vote DALLAS, TX 75234 these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. See the reverse side of this notice to obtain proxy materials and voting instructions.

 

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: 1. NOTICE AND PROXY STATEMENT 2. ANNUAL REPORT How to View Online: Have the information that is printed in the box marked by the arrow            XXXX XXXX XXXX (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 7, 2011 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box M31052-P08214 marked by the arrow            XXXX XXXX XXXX available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

 

Voting Items The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees: 1a. Martin G. McGuinn 1b. Daniel S. Sanders 1c. John K. Wulff The Board of Directors recommends you vote FOR the following proposal: 2. To approve an advisory vote on executive compensation. The Board of Directors recommends you vote 1 year on the following proposal: 3. To designate the frequency of periodic advisory votes on executive compensation. The Board of Directors recommends you vote FOR the following proposal: 4. To ratify the selection of KPMG LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2011. NOTE: In their discretion the Proxyholders are authorized to vote on such other matters as may properly be brought before the meeting in accordance with the provisions of the Company’s Third Amended and Restated By-Laws.

M31054- P08214