Bootstrap selectpicker align to right

Question

I want to align the selectpicker in Bootstrap to the right. Below is how it looks currently:

enter image description here

This is the code:

     <div class="input-prepend input-append text-right">
        <select class="selectpicker">
          <option class="text-right">مرة واحدة</option> 
          <option class="text-right">اسبوعي</option>
        </select>
      </div>

I was able to align the options to the right, but not when they are selected. Any advise?