Some viewers who tuned in to Usher’s Super Bowl Halftime Show this weekend think the R&B singer might have gotten a little too close with surprise guest Alicia Keys, RadarOnline.com has learned. The show took place at Allegiant Stadium in Las Vegas, Nevada on Sunday night, and it was a night to remember. The first guest to join Usher on stage was none other than Alicia Keys. The pair performed their 2004 duet My Boo after Keys treated the audience to a snippet of her classic hit If I Ain’t Got You. The crowd went wild as these two talented artists shared the stage, but some took to social medi…