Nicole Richie thinks her husband Joel Madden looks "hot" in his new music promo.

The 30-year-old star took to her Twitter page to gush about her beau. Good Charlotte bandmates Joel and his twin brother Benji released their debut mixtape a few weeks ago.

Their collaborative effort also features emerging artist Machine Gun Kelly, and the new video for the track Oh My God (OMGMGK) has now been released.

Nicole thinks her rock star husband looks divine in the promo.

"OH MY GOD at joelmadden looks so hot in his new video with at machinegunkelly mmmmhmmmm," she wrote on the social networking site.

Meanwhile, Joel took to his own Twitter page to share his excitement over his recent musical purchase. The 32-year-old singer and guitarist expressed his delight at his new instrument.

"AWESOME DAY! I just got my dream guitar! The Jackson Browne signature acoustic for at gibsonguitar Worth every penny! I'm so excited to play ," he exclaimed.

Joel and Benji's mixtape entitled The Madden Brothers: Before Volume 1 - features new artists the brothers were personally interested in.

Kreayshawn and Wiz Khalifa both make an appearance.