Ultimatums are a last resort to get someone to do what we want, but many times they backfire. Of course, these also apply to romantic relationships, where requests often revolve around the subject of marriage and having children, but can really include anything (as you will find out in this gallery). The existence of a threat can help people make decisions, but ultimatums are seldom an effective method of getting someone to comply with our requests. Well, sometimes...
In this gallery, we bring you a number of celebrities who issued ultimatums to their partners. Click on to discover the full story.