Karizma sing "Kolko mi lipsvash" ("How much I miss you").
Here is a short bio from their Myspace fan page:

Duet KariZma, the hip Bulgarian duet, was created in 1999 by the two friends Galya and Miro. For less than five years the couple succeeded in becoming the most acclaimed Bulgarian pop artists. KariZma is particularly popular among the young and trendy. They have won a number of prestigious awards, including this year’s awards in the categories “Best Song” (awarded by the biggest Bulgarian music television, MM TV) and “Best Duet/Trio” (awarded by BG Radio, the radio devoted to Bulgarian music). They frequently perform abroad; they’ve had concerts in Munich, Vienna and Paris, to name but a few. A couple of years ago, KariZma won two 1st prizes at the Sunflower International Music Festival in Serbia for their hit single “Yurudum”. Both Galya and Miro are composers and songwriters and some of their hits have won the acclaim and awards for admired Bulgarian artists. Their hit singles include: “I Risk to Have You”, “How I Miss You”, “MR. KILLER” and their new, yet a classic already, song “You Pass Through Me”. There has not been a song KariZma recorded that wasn’t hasty to go up the charts. The couple’s new album, Eclisiast, is just about to come out and public attention for it is immense. Without a doubt, KariZma is genuinely loved by the entire Bulgarian audience and it looks like they’re here to stay. Their first song is entitled "Riskuvam da te imam" and led the group to be "phennomenal" - Karizma is the only Bulgarian act receiving 9 awards in a year while nominated in 16 categories. Their second single was "Kolko Mi Lipsvash" (I Miss You So Much). "Shte Izbiagam Li Ot Teb" (Will I Run Away From You?) is a song dedicated to victims of home violence. "Mr. Killer" was about drug dealers.

This song is called "Riskuvam da te imam" ("I'm at risk to have you").

Karizma gave a try at singing their best known song ("Kolko mi lipsvash") in English, but one must admit it sounds much less good than the original Bulgarian version.

Here's a short bio from their LastFM page:

Karizma ("КариZма" or "Каризма" in Bulgarian) is a very popular Bulgarian pop duo. It includes Galya, who was born in Siberia and grew up there, and Miroslav. Their first song is entitled "Рискувам да те имам" and led the group to be "phennomenal" - Karizma is the only Bulgarian act receiving 9 awards in a year while nominated in 16 categories. Their second single was "Колко ми липсваш" (I Miss You So Much). "Ще избягам ли от теб?" (Will I Run Away From You?) is a song dedicated to victims of home violence. "Mr. Killer" was about drug dealers. The band released their first album "Еклисиаст Том I" in the year of 2006. It was a package with a CD and DVD (which included videos and performances at different shows). The CD contained all the previously released singles, some new tracks and remixes of "Минаваш през мен". Каризма's latest single is "All in Love".

Karizma perform live on Bulgaria's "Survivor" show.

This is a live performance on Slavi Trifonov's "Slavi show", one of Bulgaria's most watched television shows.

Karizma performs "Shte vali", which means "It will rain".

Karizma performs "Minavash prez men", which means "You are passing through me".

Karizma's entry for the Bulgarian selections to the Eurovision song contest.

"Viarvam v teb" means "I believe in you". This is a live performance on Slavi Trifonov's "Slavi show", one of Bulgaria's most watched television shows.