It's rainy and drab outside and the only thing making us feel better is watching videos in which Applegirl shows off her amazing abilities with the iPhone. This YouTube sensation performs hit songs using a collection of apps on several different iPhones. Yesterday it was a three-phone version of Beyonce's "Irreplaceable," and today she's taken a stab at Lady Gaga's "Pokerface" using four phones. She seems to use a mix of looping drum beat apps, guitar chord apps, and, for Pokerface, the T-Pain autotune app for that modern vocal sound. Here's a look at both videos. However, here's a heads up--Applegirl doesn't get into the swing of things with Irreplaceable till 1:34 into the video and the cat making the rounds in Poker Face is very distracting. Enjoy. Related Content: Discoblog: Book-Balancing, Rubik’s Cube-Solving, Pi-Reciting Geek Girl Goes Viral Discoblog: The Mother of all Rube Goldberg Machines! Discoblog: Will Watching Videos of the Great Outdoors Make Cows “Happy and Productive”? Discoblog: Quirky Musicians + Clever iPhone Apps = the MoPho Orchestra