Tang Yan is listed as almost 5'7, so if she wore around 3 inches, she'd be around 5'10. The way she's standing in the first picture looks like she's wearing heels. I found a video that shows she's actually wearing flats in the picture with Hu Ge.
It's at around 1:52
http://www.mycooktube.com/video/dBn0...-Bejing-2.html
Hu Ge is listed as over 6'0, so that would still be more than Tang Yan with or without heels.
I do think it's possible that Ekin has added an inch, though probably not more than that. From pictures (I just googled him, lol), I'd estimate he's 5'9. Against popular belief, thinness does not actually make one look taller. It's a strange thing, but if you look at high fashion models, you wouldn't guess how many are 6'0 or above.