FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
OMB APPROVAL
OMB Number: 3235-0287
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Blackstone Management Partners IV L.L.C. 		2. Issuer Name and Ticker or Trading Symbol

Celanese CORP [ CE ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      __ X __ Other (specify below)
See remarks
(Last)          (First)          (Middle)

345 PARK AVENUE 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/14/2007
(Street)

NEW YORK, NY 10154
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Series A common stock, par value $0.0001 per share   5/14/2007     M    92332   D (1) (2) (3) $16.00   92332   D   (3)  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (right to buy)   $16.00   5/14/2007     M        92332    12/31/2006   (1) 1/25/2015   Series A common stock, par value $0.0001 per share   92332   $0   30778   D   (1) (2) (3)  

Explanation of Responses:
(1)  Granted pursuant to the Issuer's 2004 Stock Incentive Plan. The options vested with respect to 25% of the option shares on each of January 25, 2005, December 31, 2005 and December 31, 2006, and will vest, subject to the continued service of Messrs. Chinh E. Chu, Benjamin J. Jenkins, Anjan Mukherjee, Hanns Ostmeier and James A. Quella as directors of the Issuer, with respect to 25% on December 31, 2007.
(2)  All rights to the non-qualified stock options were issued to the Designated Filer in connection with the services of Messrs. Chinh E. Chu, Benjamin J. Jenkins, Anjan Mukherjee, Hanns Ostmeier and James A. Quella as directors of the Issuer.
(3)  As controlling members of the Designated Filer, Peter G. Peterson and Stephen A. Schwarzman may be deemed to beneficially own the securities held by the Designated Filer. Each of Messrs. Peterson and Schwarzman disclaim beneficial ownership of such securities, except to the extent of their respective pecuniary interest therein.

Remarks:
Designated Filer, together with Blackstone Capital Partners (Cayman) Ltd. 1, Blackstone Capital Partners (Cayman) Ltd. 2 and
Blackstone Capital Partners (Cayman) Ltd. 3 (collectively, the "Partnerships"), has entered into an Underwriting Agreement
in connection with a secondary offering of the Issuer's Series A common stock. Accordingly, Designated Filer may be deemed
to be a member of a group with the Partnerships for purposes of Section 13(d) of the Securities Exchange Act of 1934, as
amended. This Statement shall not be construed as an admission that the Designated Filer is, for purposes of Section 13(d)
or otherwise, a member of any such group.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Blackstone Management Partners IV L.L.C.
345 PARK AVENUE
NEW YORK, NY 10154
X
See remarks

Signatures
/s/ Robert L. Friedman 5/15/2007
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

Exhibit 99.1

Joint Filer Information

Date of Event Requiring Statement: May 14, 2007

Issuer Name and Ticker or Trading Symbol: Celanese Corporation (CE) 

Designated Filer:                          Blackstone Management
                                           Partners IV L.L.C.

Other Joint Filers:                        Peter G. Peterson and
                                           Stephen A. Schwarzman

Addresses:                                 The principal business address of
                                           each of the Joint Filers above is
                                           c/o The Blackstone Group,
                                           345 Park Avenue
                                           New York, New York 10154

Signatures:
                                           By:  /s/ Peter G. Peterson
                                                ---------------------
                                                 Peter G. Peterson

                                           By:  /s/ Stephen A. Schwarzman
                                                -------------------------
                                                 Stephen A. Schwarzman