This was the year everyone went gaga for Lady Gaga. The shape-shifting pop star takes home Billboard’s top artist of the year honors, just a year after she earned top new artist applause. The last time an act made a move from “new” to “top” faster was in 2006, when Chris Brown snared both titles concurrently. Before that, the last woman to graduate nearly as fast was Whitney Houston, who was our top new artist of 1985 and then became the top artist the following year.Gaga takes the artist of the year honor thanks in part to the chart performance of her first two albums, “The Fame” and “The Fame Monster” (both on Streamline/KonLive/Cherrytree/Interscope), which rank at Nos. 4 and 13, respectively, on the year-end Top Billboard 200 Albums tally. Four singles from those albums appear on the Hot 100 Songs roundup, led by “Bad Romance” at No. 8.Thanks to Bilboard.com