Some of us end up watching the room spin on our birthdays. But healthy Lady Gaga took her friends spinning. The pop diva, 26, was spotted at SoulCycle in West Hollywood on Wednesday, burning calories at a “private spin class” for her and her pals. “It was a full class,” a spy told us. It was a departure from her 25th birthday last year, when the “Born This Way” singer belted out tunes by Mötley Crüe and Madonna in front of 60 friends at a surprise bash.