真是个惊喜！

This really is a nice surprise!

Source: Tatoeba

Sentence Composition

=1 真是 zhēnshi
  1. indeed; truly
  2. (coll.) (used to express disapproval, annoyance etc)
=1 真是 zhēnshì
  1. (colloquial) Used to express dissatisfaction or annoyance; honestly!
  2. Used other than figuratively or idiomatically: see 真 (zhēn), 是 (shì): (it) really is; (it) truly is
  3. Used to express dissatisfaction or annoyance; honestly!
=2 个 gě used in 自个儿 zìgěr
=2 个 gè
  1. (classifier used before a noun that has no specific classifier)
  2. (bound form) individual
=2 个 gè variant of 个 gè
3 惊喜 jīngxǐ
  1. nice surprise
  2. to be pleasantly surprised