3. Jennifer Aniston and John Mayer

Actress Jennifer Aniston and singer John Mayer pose at the 2009 Vanity Fair Oscar Party in West Hollywood, California February 22, 2009. [Agencies]

In March 2009, former "Friends" star Jennifer Aniston, 40, and singer-songwriter Mayer, 31 ended their relationship for a second time, weeks after a high-profile date at the Oscars ceremony fuelled rumors of marriage. According to People Magazine in the US, a source said: "They had some disagreements and decided to not continue to see each other." Her 2006 divorce to Brad Pitt after four years of marriage was the subject of mountains of newsprint, notably after rumors surfaced of infidelity between Pitt and his new lover, actress Angelina Jolie.