Kevin Federline thinks he's very underestimated--more underestimated, in fact, than anyone else out there. And K-Fed's so secure in his manhood that he can go out and buy wife Britney's tampons without a hint of embarrassment.

The aspiring rapper, whose album "Playing with Fire" drops next Tuesday,tells Entertainment Weekly (via MSNBC) that he is "the most talked-about [person] of anyone over the last couple of years," a claim that, for better or worse, isn't terribly far from the truth. And when asked to name the most underrated performer in rap, K-Fed apparently gave it about 12 seconds of thought, and then said, "Me."

And he also shared his feelings about feminine-hygiene-shopping with the mag. "I used to be embarrassed to go to the store and buy tampons, but that's past tense," said Federline. "Once you make it through that, then you're good."