Ownership Submission
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
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 (Month/Day/Year)
05/14/2007
(Street)

NEW YORK, NY 10154		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 05/14/2007   M   92,332 D (1) (2) (3) $ 16 92,332 D (3)  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(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 05/14/2007   M     92,332 12/31/2006(1) 01/25/2015 Series A common stock, par value $0.0001 per share 92,332 $ 0 30,778 D (1) (2) (3)  

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   05/15/2007
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(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.

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