Lady Gaga pulled off a major achievement on the UK singles chart this week as her latest single "Shallow" with Bradley Cooper climbs 4-1, dethroning last week's leader "Promises" by Calvin Harris and Sam Smith. The lead single from A Star Is Born shines bright atop the chart with 40,000 units sold in its fourth week. "Shallow" becomes Gaga's first number one single in the UK in over eight years. Her previous chart-toppers are "Just Dance" (2009), "Poker Face" (2009), "Bad Romance" (2009), a