Shania Twain abruptly stopped her show in London to blow her nose — but still managed to deliver a captivating performance, RadarOnline.com has learned. The country music icon, 58, profusely apologized to fans for the bizarre moment. Video taken from Twain’s concert at BST in Hyde Park captured the singer halting her performance to pull a tissue from her pocket. The 58-year-old singer took a moment to apologize to the crowd, telling them, “Pardon me” before she blew her nose into the tissue. “I have a little cold but who cares, just a little sniffle,” Twain noted before expressing gratitude to…