Britney Spears is All Smiles in London (PHOTOS)

Brit's Boys!
Check out Britney Spears' sons through the years.
Now we know where Britney Spears was headed when we saw her at LAX on Wednesday!

The 29-year-old singer was seen outside KIIS FM studios in London on Thursday, and was smiling ear to ear as the paps snapped away. Looking cute in a plaid red top, Brit, who usually wear her hair down, pulled back her blonde locks.

When it comes to fashion these days, Brit is keeping things casual!

Check out some photos of her as she departed LAX on Wednesday.

Britney is overseas getting ready to kick off the European leg of her Femme Fatale tour.

Take a look at the rest of Britney in the gallery!