Financial services company American Express is promoting "#katyperrytix," the number one topic on Twitter, on the morning of January 24.
The hashtags "#howareyouathug," "#becauseimblack" and "#yoerafelizhastaque" fill second, third and fifth positions.
Twitterers are reporting that fitness guru "Jack LaLanne" passed away suddenly on Sunday, January 23 at the age of 96.
Indian vocalist "Pandit Bhimsen Joshi" has also passed away and microbloggers are paying their respects with 140 character tweets.
"Someone said, 'Music is what life sounds like.' Pandit Bhimsen Joshi's life was legendary. RIP," tweeted one microblogger.
Professional tennis players "Milos Raonic" and "David Ferrer" take seventh and ninth places in Twitter's trending topics.
Mean Girls character "Regina George" is in sixth place and American director "Kevin Smith" is in tenth place.
The top 10 most talked about topics on Twitter on January 24 at 7:45 AM GMT are:
- #katyperrytix (promoted)
- #howareyouathug (new)
- #becauseimblack (new)
- Jack LaLanne (new)
- #yoerafelizhastaque (new)
- Regina George (new)
- Milos Raonic (new)
- Pandit Bhimsen Joshi (new)
- David Ferrer (new)
- Kevin Smith (new)