Optimize the following Python code by replacing the for-loop with a list comprehension
def hipsterify(sentence):
  hipster_sentence = []

  for i in range(len(sentence)):
    hipster_sentence.append("hipster " + sentence[i])

  return ' '.join(hipster_sentence)
def hipsterify(sentence):
  return ' '.join(["hipster " + word for word in sentence])