Kate Gosselin celebrates sextuplets' birthday; Jon Gosselin lies 'for attention'?

jon-kate-gosselin-getty.jpg Jon Gosselin is a big fat ... liar?

The Gosselin sextuplets turn 6 years old Monday (May 10), and the plan has been for the kids to celebrate their big day with both Jon and Kate Gosselin (separately, of course).

However, Jon tried to paint a different picture when cameras approached him last Thursday.