Here's the review I wrote for Amazon:
"My Girlfriend's Boyfriend" is just what a romantic comedy should be: cute, romantic, and funny. It's also incredibly clean. The writer/director didn't rely on any gross-out or sex humor; instead, the story was filled with genuinely funny moments. Especially watch for the gum commercial--I laughed out loud repeatedly (and am chuckling again as I think about it)! This isn't your predictable chick flick; sure, you can probably guess who will end up together, but the route the movie took from point A to point B wasn't at all what I expected. I'm always on the lookout for movies I can recommend without reservation, and this is definitely one. Highly recommended!
***Update 11-6-11: You can watch this for free on Hulu. It's also streaming on Netflix and on Amazon(Prime members can watch it free). And there's a DVD, which I bought for $10 at Walmart. Amazon has it for $12.60.***