Matthias Opendhövel is a TV host in German TV. He hosted Stefan-Raab-Shows like "Unser Star für Oslo" or "Unser Song für Deutschland".
I guess, he's good friends with Lena. He also knows Stefan Raab privately.

In the last "Tv Total" episode, they talked about which football club is whos favorite and Lena told, she was in trouble with Matthias, because her favorite is 1. FC Cologne and his is FC Mönchengladbach.