For a bunch of those weeks, No. 2 belonged to Lady Gaga and Bruno Mars' "Die With a Smile," which finally claimed the chart's top spot last week — its 20th week on the Billboard Hot 100.

On Thursday, a couple weeks after giving birth to baby Kulture, the 25-year-old performer apologized to fans for deciding to skip the 24K Magic World Tour she had planned to join Bruno Mars for in ...