Sources have been claiming that Kate Middleton has been "going a bit stir-crazy" since beginning her third trimester, E! News reports, and the Duchess of Cambridge has decided to create a playlist of tunes for the royal birth.

In addition to soothing classical music, the Duchess will reportedly will be picking some chart-topping hits to help her relax during labor.

"She has been filling her iPod with music she wants playing while she's in labor," a source told E!. "The other day she downloaded some of Bruno Mars, Calvin Harris and Of Monsters and Men."

Middleton is no stranger to famous names in music, as pop singer Ellie Goulding performed a special rendition of "Your Song" at the royal wedding reception in 2011, and classical artist Paul Mealor has written a lullaby for the royal baby.

Titled "Sleep On," Hayley Westenra will record the song just in time for the newborn's arrival.

"After writing music for the royal wedding, it seemed natural to provide the musical accompaniment for the next stage in the royal couple's journey together, Mealor said in a statement.

"Paul and I got to work together on a song called 'Sleep On' in honor of William and Kate's new arrival as it's such a joyous occasion which we can all celebrate," Westenra said on the exciting opportunity.

Middleton is reportedly planning on having a natural birth next month in mid-July (the predicted due date is July 13) in the private Lindo wing at St. Mary's Hospital in London, according to Wetpaint Entertainment. The Duchess is also considering hypnotherapy for her delivery.

With no shortage of great music to choose from, we wonder what the Duchess will have on her royal birth playlist! If released to the general public, we have a feeling it would sell big in the UK.