Will the Cassette I just ordered fit?
 

My bike has a 10 speed triple crank with 9 Speed everything else.

Everything is Shimano except for the Cassette which was SRAM PG 950 12-25, so I purchased a 9 Speed Ultegra 11-23 Cassette.

There wont be a problem with the crank and the 11-23 cassette will there?

No,

You're replacing a 9s 12-25, with a 9s 11-23 with the same spacing.

There's an infinitesimal risk that the chain may be too long by 1/4" based on the size reduction of the smallest sprocket. But that would only come into play if your chain is now right on the edge of being too long.

Great, thanks for the quick reply!

Why'd you ask AFTER you ordered?

Maybe he didn't think to ask first?
Then in a moment of enlightenment, thought to ask to see if there might be potential problems?