'How I Met Your Mother': Robin and Barney are on

Robin and Barney together, Ted beginning his teaching career and a Marshall-Lily flashback? Why thank you, "How I Met Your Mother."

CBS has released its first photos from the new season of "HIMYM," along with a description of the premiere, and from what we can gather all those things will take place in the season premiere on Sept. 21. The episode is called "Definitions," and in it everyone finds out that Robin (Cobie Smulders) and Barney (Neil Patrick Harris) are carrying on a secret romance but aren't yet willing to define their relationship. Also, Ted (Josh Radnor) is nervous about teaching his first class.

Let's have a look at the photos (all courtesy CBS). First up, Robin and Barney looking all shmoopy, so there's the romance part.

Robin-barney 

My first thought when I saw this: Holy crap, Lily (Alyson Hannigan) is pregnant! My second thought: Oh, wait, she's coloring her hair -- so maybe not.

Marshall-lily-icecream 

I'm guessing this isn't the kind of first impression Ted wants to make on his students.

Ted-class 

Not sure what the context will be for the Lily-Marshall (Jason Segel) flashback, but those scenes tend to be really funny.

Marshall-lily-flashback 

And, of course, Ted making like Indiana Jones. Because, well, just because.

Ted-whip 

"How I Met Your Mother" returns to CBS at 8 p.m. ET Monday, Sept. 21.

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