P!nk is dominating the charts with "Caught Up", which has been #1 in the U.S. for 5 weeks now (with no promo). It is the second single from her second album, Lonely.
Rihanna's first single "The Turning Tides" from her greatest hits album, The Best Of Rihanna, has been a slow burner on the charts. It has so far peaked in the top 5 in all charts, peaking at #1 in Canada, Europe and WW. The album bombed in comparison to the rest of her albums (a 5 track EP titled Daydream sold twice as much

).
Beyonce's second single "I Tried" from her third album, Revolution, just debuted in the top 3 in all markets, hitting #1 in the UK, Latin America, Oceania and WW. If it were to go #1 in the U.S. and Canada, it would be her 8th consecutive #1 single (all of her songs have hit #1, most have hit #1 in all markets with the exception of one or two poorly promoted singles).
Blood Orange, Foster The People and The Weeknd are dominating the singles charts worldwide. Lady Gaga's single "Reality Check" is starting to drop after spending 6 weeks at #1 in the U.S. and WW.