R2-D2 Spotted in Transformers 2

Way back in June, it was leaked that R2-D2 makes a cameo appearance in Transformers: Revenge of the Fallen but exactly when was never revealed. Thanks to Jetfire_J here is the proof of his very brief appearance as part of the debris field during the desert fight.

Update: From the comments, the moment occurs during the merge of Jetfire's parts to Optimus Prime, specifically at 2 hours 17 minutes and 52 seconds into the movie.