Victoria's Secret's extravaganza of a fashion show is being taped tonight at the 69th Regiment Armory in Manhattan.
Many of the models are Victoria's Secret's superstars and are guaranteed to walk the runway, but some others get slotted into the glamorous gig.
It's a lengthy selection process, culminating in two days of callbacks.
Show producer Monica Mitro explains the casting process to ET:
"We really start thinking about it a year in advance and we see girls all year long. During these two days, we see all the callbacks, all the girls that we've liked throughout the year, the girls that we might have seen in magazines or in other shows or that we have shot ourselves that we wanted to try for the runway ... It's a long process."
Here's a look behind-the-scenes, from ET:
NOW SEE: 18 Years In The Evolution Of The Victoria's Secret Fashion Show >
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