Actress Katie Holmes recently filed for divorce from her husband of five years, actor Tom Cruise, and that's not the only relationship news in Hollywood to cause a ruckus of speculation among celebrity watchers.

From happier news like the engagement of actors Angelina Jolie and Brad Pitt to the shocking split of model Heidi Klum and singer Seal, here are other celebrity relationship developments that made headlines and raised a few eyebrows.

It's only July. What else could possibly happen by the end of December?