If you watched last night's BCS championship game ... you know announcer Brent Musburger was a little OBSESSED with AJ McCarron's super hot GF Katherine Webb (and rightfully so).
But despite some serious criticism following the game (people were calling him "creepy") ... Webb tells TMZ she was actually "flattered" by her 73-year-old admirer.
After hearing about Musburger's barrage of compliments (he encouraged kids to learn how to play QB so they could also score chicks like Webb) ... Katherine tells us, "I laughed hysterically. I was flattered ... and slightly embarrassed ... but I thought it was the funniest thing ever. I never expected that."
She adds, "I've been reading on Twitter that Musburger had backlash that he's 'Creepy' ... if I were to see him I would say, 'I don’t think you're creepy at all!'"
Webb tells us the exposure has been great for her social media presence -- "I had 2,300 followers on Twitter yesterday ... in the past 24 hours, I have gained over 125,000."