You must be refering to either the shallow depth of field and/or the tone.
For shallow depth of field, ie. out of focused background and with the subject "popping out". You would want to look into prime lenses although this could easily be achieved through using manual focusing with your kit lens. Personally, i find using a wide aperture prime lens is best.
The quality of the "blurness' will vary. Another word for this is bokeh - type "bokeh" in flickr or google and view the images.
For the tones, you want to have that blue-ish/green-ish tone. Boost the Blue and Green channel. You might want to observe the quality of the mtv. It's quite low contrast in the background and slightly too bright. Mess around with those settings in your favorite post-processing software.
Hope this helps but if I've guessed wrongly. You can always ask again.