Your fiancee is lucky. Lol. (: 
"Sonny with a Chance"
"Hatching Pete"
Many people are wondering how old exactly is Tiffany Thornton and no one can really say. When asked Tiffany chose not to answer the questions and we don’t blame her. However during some research online a fan was able to speculate how old she can be and here is what they found out.
after doing some research, I can say she graduated in 2003 or 2004. no wonder she looked so perfect in her cheerleader outfit (in the 2nd ep) – she was one!
“The A& M Consolidated varsity cheerleaders performed a routine at the Contest of Champions National cheerleading competition on Feb. 22 [2003] at Disney’s Wide World of Sports Complex in Orlando.
Varsity squad members: Co-captains Katherine Huffman and Sarah Ward, Jenna Blythe, Brittany Cochrane, Melissa Davis, Malori Isham, Jacque Jeter, Abby Lane, Elise Maraist, Elizabeth Marks, Katy Myrick, Megan Rychlik, Stephanie Sams, Tiffany Thornton and Kelley Turley.”
If she was a senior in 2003, about 18, that would put her at 23 years old (if she hasn’t had her birthday yet). her colors were maroon and white.
source: http://209.189.226.235/community/youthlines/031603youthlines.htm
So it seem that Tiffany Thronton may have just turned about 23 years old, but we don’t know for sure. Only Tiffany can put us at ease when she decides to tell us how old she really is. Who cares anyway? She is an amazing actress and her age should make a difference.