Priscilla Chan and Mark Zuckerberg at their May wedding. (Allyson Magda/AP)

In the year that Facebook founder Mark Zuckerberg wed college sweetheart Priscilla Chan , there were surely some other sweet and simple VIP relationship milestones — but most seemed awfully complex:

Beyonce and Blue Ivy. (Ed Burke for via AP)

Blue Ivy Carter born to Jay-Z and Beyonce as a squad of trademark lawyers deployed to protect her name.

David Petraeus and Paula Broadwell, who found that secret e-mails are crazy sexy — until they’re just crazy.

• CNN’s Dana Bash and John King separate — but continued working together on-air.

• NFL quarterback Jason Campbell and Jenny Montes call off wedding just hours before Caribbean ceremony.

Dennis Quaid and wife Kimberly file for divorce. Then reconcile. Then file for divorce again.

Rielle Hunter (George Burns/Harpo Productions via AP)

Rielle Hunter reveals she and John Edwards are on-again. Then off-again. And now, maybe, on-again.

Kristen Stewart issues groveling public apology for cheating on Robert Pattinson — and it works! She got him back!

Kate Middleton forced to announce pregnancy early, after super-public bout of morning sickness.

Katherine Kallinis forced to keep pregnancy secret until “D.C. Cupcakes” season premiere.

Mary Cheney and Heather Poe have a groundbreaking GOP royalty gay wedding — and keep utterly quiet about it.

Chris Cooley (Matt McClain for The Washington Post)

Danny DeVito and Rhea Perlman bafflingly split — the Al and Tipper of the sitcom world?

Chris Cooley and Christy Oglevee Cooley bafflingly divorce — the Al and Tipper of the Redskins?

Dinesh D’Souza loses job after trying to juggle new girlfriend, not-yet-ex-wife, while president of a Christian college.

TomKat, the stunning schism of Hollywood corporate merger, suggests the relationship maybe wasn’t so fake after all.

Tom and Katie in happier times, or something, last February. (Evan Agostini/AP)

See also: The Reliable Source Persons of the Year for 2012

The Reliable Source Year in Controversies

Zing! Best quotes of 2012: Bryce Harper, Martin Short, Ronan Farrow, Madonna and others

Earlier in Reliable Source: White House Christmas shopping; Sam Donaldson; Romney Christmas card; Taft Bridge lions