Maybe there are three versions (Grace Kelly 2 Euro Monaco 2007).
1] The link Roy gave mentions a test/trial/essai coin.
2] There is a normal (presumably) coin ...
Bi-Metallic Nickel-Brass center in Copper-Nickel ring
Subject: Princess Grace, 25th Anniversary of Death
Obv: Head of Princess Grace left
Rev: Relief map of Western Europe, stars, lines and value
Reference: KM# 186
3] There is a Proof coin also >
http://www.ebay.co.uk/itm/2007-Monaco-2-Euro-Commemorative-Grace-Kelly-Coin-Proof-VERY-RARE-/190616141471?pt=UK_Coins_European_RL&hash=item2c619b7e9f
which says on there ...
Issue Date: July, 2007
Country: Monaco
Subject: 2 Euro Commemorative Coin Marking the 25th Anniversary of the Death of Grace Kelly
- Proof coin supplied in box. Very Rare.
Condition: Proof
Limited Quantity Issued: Only 20,001 pieces
Description: On the inner part of the coin there is an effigy of Grace Kelly in profile, facing to the left. MONACO, the mint mark, the year mark and the engraver's mark are engraved in an arc at the bottom right of the inner part. The name of the artist R.B. BARON is engraved under the Princess' hair. The twelve stars of the European Union surround the design on the outer ring of the coin.
The most rare 2 Euro Coin!
NOTE: It was unsold at £1,889 - and said the effigy was to the right, so I changed it to left.
Not sure if those other two have a KM# number.
Here is a picture (click to enlarge) - which of the above it is like I am not sure ...